Thunder header exhaust

Black X-Series Exhaust System - 1073XB Thunderheader. $1,656.00. Part #: 4409870 Mfg Part #: 1073XB. Add to compare. Results per Page. Viewing Results 1 - 2 of 2. Prev. Shop for Thunderheader Exhaust for your 2024 Harley-Davidson Road Glide Limited - FLTRK at Dennis Kirk.

The rise of the individual in this group-oriented society is drawing interest from businesses—and concern from the government. Seoul, South Korea “Drinking alone is welcome here,” ...exact fit. (34) Chrome Thundercone Slip-On Mufflers - 1061 Thunderheader. $715.50. Part #: H25010 Mfg Part #: 1061. Results per Page. Viewing Results 1 - 5 of 5. Shop for Thunderheader Exhaust for your 2014 Harley-Davidson Street Glide - …Watch this video for some tips on how to choose a quiet bathroom vent fan and where to exhaust the air to prevent mold and mildew. Expert Advice On Improving Your Home Videos Lates...Please click like if you like the video!Please check out my main channel for more videos:https://www.youtube.com/channel/UCcNfwWx33aOEUgm8D-OS71g-----...Sep 28, 2014 · This is an Exhaust SOUND Comparison video only, between the Thunderheader, Vance & Hines Pro Pipe, and the Bassani Road Rage. all 3 bikes are 2013 Dynas with... Find Flowmaster American Thunder Exhaust Systems and get Free Shipping on Orders Over $109 at Summit Racing! Flowmaster American Thunder exhaust systems are designed with the latest exhaust technology available--resulting in improved acceleration, passing power, and fuel mileage. A key to these performance upgrades is Flowmaster's use of mandrel-bent tubing, which allows superior exhaust gas ...

Onimoto has an interesting post about how to trace an e-mail. Onimoto has an interesting post about how to trace an e-mail. The purpose of this guide is to show the process involve...Thunderheader Harley-Davidson Exhaust Systems. I know the type. Exhaust Type. Results per Page. Viewing Results 1 - 26 of 26. Sort by | Relevance. (20) 2 into 1 High …Black X-Series Exhaust System - 1073XB Thunderheader. $1,656.00. Part #: 4409870 Mfg Part #: 1073XB. Add to compare. Results per Page. Viewing Results 1 - 2 of 2. Prev. Shop for Thunderheader Exhaust for your 2024 Harley-Davidson Road Glide Limited - FLTRK at Dennis Kirk.Thunderheader Racing Products, Richmond, California. 8,966 likes · 3 talking about this. www.thunderheader.net2018-2022 Harley-Davidson M8 Softail X-Series™ 2-into-1 Exhaust. FOLLOW US: All THUNDERHEADER™ Exhaust Systems are legal for CLOSED-COURSE COMPETITION use only. CALIFORNIA RESIDENTS CLICK HERE.Featuring a 2-into-1 design with a patented collector, this exhaust system directs spent exhaust gases in a spiral motion through four acoustical dampening chambers. This unique design enhances exhaust scavenging, effectively eliminating back pressure and improving overall engine performance.Add to compare. exact fit. Road Rage Type III Stainless 2-Into-1 Exhaust - 1D1SS Bassani. $1,044.95. Part #: 4408762 Mfg Part #: 1D1SS. Add to compare. Results per Page. Viewing Results 1 - 40 of 83. Shop for 1998 Harley-Davidson Dyna Super Glide - …

The new Thunderheader™ X-Series™ for Touring is our large diameter exhaust specifically designed for big cubic inch engines, built to produce big numbers. The X-Series™ is designed with 2 in. primary tubes with a 12 degree transition chamber to allow more exhaust flow. Unique patented baffle in conjunction with the trademark tail cone is ...Ported and polished SE heads 2" HTCC exhaust valves S&S 585g cams, SE 10.5 forged pistons Thunder Max EFI Gerolomy Intake and dual runner 50mm throttle body RB Racing LSR's "C" 2 into 1 Hydraulic Clutch with AIM VP83T VPC Lyndall Z-pads Board of Directors Rolling Thunder® VA. Chapter #3Thunderheader was one of the first companies in the aftermarket exhaust world for Harley's. After 30 years, there is still just one conclusion: The Thunderheader just works. Sound, performance, everything- … 1970-1983. Fits all models without floorboards. Sold Seperately - Heat Shields # 1088 (top rear), 1098 (top front), & 1090 (collector) 1020. 1020B. Heat Shield set of 3. 1120. 1120B. Thunderheader™ Exhaust Systems are legal for CLOSED-COURSE COMPETITION use only. Product Details. Fitment. Thunderheader Black 2-into-1 High Performance Exhaust System. Designed to give maximum horsepower without sacrificing low-end torque. 2-into-1 systems with patented collector design that directs spent exhaust gases in a spiral motion through four acoustical damping chambers. Exhaust travels through these chambers at ... Heat Shield Set for 2 into 1 Exhaust System 2014-2020 H-D Sportster - Forward Controls - Chrome Thunderheader. $161.60 $404.00. Thunderheader was one of the first companies in the aftermarket exhaust world for Harley's. After 30 years, there is still just one conclusion: The Thunderheader just works.

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Black Long Style High-Performance 2-Into-1 Exhaust System with Heat Shields - 1024SB Thunderheader. $1,399.00. Part #: 4408739 Mfg Part #: 1024SB. Add to compare. Results per Page. Viewing Results 1 - 40 of 70. Shop for 1986 Harley-Davidson Electra Glide - FLHT Exhaust at Dennis Kirk.Thunderheader Touring. Designed to give maximum horsepower without sacrificing low-end torque. 2-into-1 systems with patented collector design that directs spent exhaust gases in a spiral motion through four acoustical damping chambers. Exhaust travels through these chambers at high velocity to scavenge spent exhaust gases from the combustion ...Chrome Thundercone Slip-On Mufflers - 1061 Thunderheader. $795.00. Part #: H25010 Mfg Part #: 1061. Add to compare. Results per Page. Viewing Results 1 - 5 of 5. Shop for Thunderheader Exhaust for your 2008 Harley-Davidson Street Glide (EFI) - …Get ready to experience unparalleled performance with the Thunderheader Long Style High-Performace 2-Into-1 Exhaust System with Heat Shields . This innovative exhaust system is designed to give you maximum horsepower without sacrificing low-end torque.

Ordered thunder header exhaust. Great job ! Customer Reviews. Based on 1 review. Write a review. 100% (1) 0% (0) 0% (0) 0% (0) 0% (0) A . Al B. Excellent products and service. Ordered thunder header exhaust. Great job ! Subscribe to our newsletter. Promotions, new products and sales. Directly to your inbox. Submit.When it comes to maintaining and optimizing the performance of your Greenheck exhaust fans, choosing the right parts is crucial. Before you start searching for replacement parts, i...Upgrade your exhaust system now and maximize your motorcycle's performance with the Thunderheader Black X-Series Exhaust System. Trust in the quality craftsmanship of …When it comes to maintaining and optimizing the performance of your Greenheck exhaust fans, choosing the right parts is crucial. Before you start searching for replacement parts, i...Thunderheader Exhaust Systems 2020 Harley-Davidson Road Glide Limited - FLTRK; Thunderheader Exhaust Systems for your 2020 Harley-Davidson Road Glide Limited - FLTRK. Filter Results. View Results Exhaust Systems Thunderheader Clear All; Ride Types Motorcycle (2) Harley ...The new Thunderheader™ X-Series™ for Touring is our large diameter exhaust specifically designed for big cubic inch engines, built to produce big numbers. The X-Series™ is designed with 2 in. primary tubes with a 12 degree transition chamber to allow more exhaust flow. Unique patented baffle in conjunction with the trademark tail cone is ...Add To Cart. $817.95. Flowmaster. Flowmaster 817129 - American Thunder Header-Back Exhaust System 1967-1968 GM Camaro/Firebird V8. Add To Cart. $854.95. Flowmaster. Magnaflow 15896 - Street Series Crossmember-Back Exhaust System 1973-74 Buick. Add To Cart. Thunderheader Racing Products, Richmond, California. 8,966 likes · 3 talking about this. www.thunderheader.net The new THUNDERHEADER X-SERIES for Touring is our large diameter exhaust specifically designed for big cubic inch engines (107" and larger), built to produce big numbers. The X-SERIES is designed with 2" primary tubes with a 14 degree transition chamber to allow more exhaust flow. Our unique patented baffle in conjunction with our trademark ... 2-into-1 systems with patented collector design that directs spent exhaust gases in a spiral motion through four acoustical damping chambers. Exhaust travels through these chambers at high velocity to scavenge spent exhaust gases from the combustion chamber and bring in a fresh charge of air/fuel mixture. Anti-reversion design works to impede ...

Get ready to experience unparalleled performance with the Thunderheader Long Style High-Performace 2-Into-1 Exhaust System with Heat Shields . This innovative exhaust system is designed to give you maximum horsepower without sacrificing low-end torque.

2-into-1 systems with patented collector design that directs spent exhaust gases in a spiral motion through four acoustical damping chambers. Exhaust travels through these chambers at high velocity to scavenge spent exhaust gases from the combustion chamber and bring in a fresh charge of air/fuel mixture. Anti-reversion design works to impede ...Flowmaster 17119 American Thunder Header-Back Exhaust System Features: Fits most 1964-1972 GM A-Bodies with V8 engines and aftermarket long tube headers. Includes hangers and hardware for easy installation. Mandrel-bent 16-gauge aluminized steel tubing for durability. Two exit style choices: Slash Cut or Turndown.Ordered thunder header exhaust. Great job ! Customer Reviews. Based on 1 review. Write a review. 100% (1) 0% (0) 0% (0) 0% (0) 0% (0) A . Al B. Excellent products and service. Ordered thunder header exhaust. Great job ! Subscribe to our newsletter. Promotions, new products and sales. Directly to your inbox. Submit.1081 posts · Joined 2008. #7 · Oct 9, 2008. There are only two pipes that rule HD world for sound and power. RB Racing's pro stock 2 into 1 and JBV Racing's Guppy III. Everything else is nuthin but wannbe's. Armed Men are citizens, unarmed men are servants. 98 FLSTF. Add-On Falsee System for X-SERIES - 1075XFB Thunderheader. $599.00. Part #: 4410982 Mfg Part #: 1075XFB. Add to compare. Results per Page. Viewing Results 1 - 9 of 9. Shop Thunderheader Mufflers/Slip-ons at Dennis Kirk. Best selection, low prices & orders over $89 ship free. We Ship Today! Get ready to experience unparalleled performance with the Thunderheader Long Style High-Performace 2-Into-1 Exhaust System with Heat Shields . This innovative exhaust system is designed to give you maximum horsepower without sacrificing low-end torque. Thunderheader Dyna Patented Anti-Reversion design that produces maximum HP without sacrificing low end torque. Complete with all hardware needed to mount. Heat shields sold separately (set of 3 part #1126 or 1131b) Current lead time is up to 16 weeks on all Thunderheader Racing Products, we do not stock them. May 4, 2016 · American Thunder Header-Back Exhaust System 1967-1968 GM Kit Includes: Flowmaster Header Back Exhaust System - 389-817129 JEGS Ceramic Coated Long Tube Headers - 555-30051. GM Camaro/Firebird V8.

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Thunderheader Dyna Patented Anti-Reversion design that produces maximum HP without sacrificing low end torque. Complete with all hardware needed to mount. Heat shields sold separately (set of 3 part #1126 or 1131b) Current lead time is up to 16 weeks on all Thunderheader Racing Products, we do not stock them.This is an Exhaust SOUND Comparison video only, between the Thunderheader, Vance & Hines Pro Pipe, and the Bassani Road Rage. all 3 bikes are 2013 Dynas with...Thunderheader jetting recommendations. I'm running a thunderheader and cv40 carb from a twin cam. The needle is the adjustable type and is currently set up in the middle position. I'm running 45 pilot and 180 main... some hesitation during the roll on in high speed. Running a mooneyes air cleaner color with the "stock" paper element...Thunder is caused by lightning, so it cannot happen independently. The loud cracking sound of thunder occurs when lightning raises the surrounding air temperature by thousands of d...An Executive Order (EO) is the document signed by an ARB official documenting ARB approval for specified motorcycles. Any aftermarket exhaust system that replaces or otherwise impacts emission control equipment, including catalytic converters, requires an EO to be sold for use in California unless the system is for competition use only ...Thunderheader 2 into 1 High Performance Exhaust System. ThunderHeader head pipes have been tuned to the proper length and diameter to produce maximum horsepower and a excellent torque curve. A patented collector is used. The collector is designed to direct spent gases through four acoustical dampening chambers.Housed in two state-of-the-art facilities, Flowmaster uses premium materials along with extensive research and design to produce advanced, dyno-tuned exhaust systems and components that deliver power gains with an unmistakable sound. Some of the most distinct exhaust systems include the Flowmaster 40 Series and American Thunder mufflers, but ...I headed out to Kingman, Arizona to the Pyland Compound to created a top mount exhaust bracket for my Thunderheader. Rather than doing the tradition bracket...Increased horsepower & unmistakable THUNDERHEADER™ sound. Year. Fitment. Chrome. Black. 2000-2006. All model Softails. Sold Seperately - Heat Shields 1305 (top rear), 1306 (top front), & 1207 (collector) 1027.Nov 15, 2011 · 1395 posts · Joined 2009. #5 · Nov 15, 2011. Fat cat hands down is best all around, i ran a thunder header for yrs, but got the money and got a better exhaust, thunder headers do well but usually have a nasty dip at around 2-2500 rpm and then pick back up. Have the dyno charts to prove the fat cat is smoother and higher output power and trq. ….

New NOS Thunderheader Harley Davidson Chrome thunder header exhaust pipe 120134. $875.00. $46.00 shipping. Thunderheader 20 1/2 in. Heat Shield for Slip-Ons and Mufflers - 1238. $113.40. Thunderheader Chrome Heat Shields for Thundercone Slip-Ons - 1166. $211.50. Only 1 left! Thunderheader Mid Rear/Top Front 9 in. Heat Shield - 1093. The anti-reversion design of the Thunderheader exhaust system prevents reverse flow through the system, which can negatively impact performance and throttle response. As the reverse flow enters the collector, the diffuser and pyramidal trap work together to impede the reverse flow, giving the exhaust valve ample time to close. HARLEY SHOVELHEAD 2 INTO 1 THUNDER HEADER EXHAUST PIPE. Opens in a new window or tab. Pre-Owned. $499.00. hillbillymotoparts (1,221) 100%. 0 bids · Time left 2d 8h left (Mon, 04:22 PM) +$38.00 shipping. Sponsored. 2011 Harley Touring FLTRU Road Glide Thunderheader X-Series Exhaust - Read 1074X. Opens in a new window or tab. Commonly Recognized As The BEST Sounding Exhaust For Harley-Davidson. Proven & Noticeable Performance Gains. Available In Black or Chrome. Includes FULL Coverage Heat Shields. Classic / Performance Look. 100% MADE IN THE USA. FITS: M8 Softail Models. #1364x - Slim, Low Rider, Fat Boy, Breakout, Street Bob, Fat Bob, Deluxe. Celtic Thunder, the internationally renowned Irish music group, has captivated audiences around the world with their powerful performances and diverse range of songs. One of the de...SKU: TTH-1058-ATTMPN: 1058Thunderheader Model 1058 Exhaust for Harley-Davidson Sportster '07-'13. $1,120.00. Custom Made for you. Ships in 6-8 weeks. Select Color: Chrome Black. By checking this box you agree that this item is for racing only and will not be used on public roads or land. Will not ship to California. Qty. exact fit. Black Heat Shields for Thundercone Slip-Ons - 1166B Thunderheader. $169.00. Part #: 252134 Mfg Part #: 1166B. Add to compare. Results per Page. Viewing Results 1 - 8 of 8. Shop for Thunderheader Exhaust for your 2020 Harley-Davidson Street Glide Special - FLHXS at Dennis Kirk. Harley-Davidson Screamin' Eagle Stage 4 with a ThunderHeader Exhaust System. Details, Test Ride, and freeway Shredding http://www.laidlawsharley.comSupport m... Thunder header exhaust, 1970-1983. Fits all models without floorboards. Sold Seperately - Heat Shields # 1088 (top rear), 1098 (top front), & 1090 (collector) 1020. 1020B. Heat Shield set of 3. 1120. 1120B. Thunderheader™ Exhaust Systems are legal for CLOSED-COURSE COMPETITION use only. , Increased horsepower & unmistakable THUNDERHEADER™ sound. Year. Fitment. Chrome. Black. 1993-1998. Fits models with center and forward controls. Sold Seperately - Heat Shields 1094 (top rear), 1095 (top front), & 1090 (collector) 1022., Exhaust Systems and Heat Shield Sets. Model 1071 THUNDERHEADER™ for 2010-2014 Touring. TRUE DUAL THUNDER™ for model years 2010-2016. Individual pipes for each cylinder and featuring our new Cross-Under™ design. Also a balance tube is incorporated in between primary tubes to improve torque. , Black Heat Shields for Thundercone Slip-Ons - 1353B Thunderheader. $211.50. Part #: 252132 Mfg Part #: 1353B. Add to compare. Results per Page. Viewing Results 1 - 40 of 53. Shop the best selection of Thunderheader Motorcycle …, Thunderheader 2 into 1 High Performance Exhaust System. ThunderHeader head pipes have been tuned to the proper length and diameter to produce maximum horsepower and a excellent torque curve. A patented collector is used. The collector is designed to direct spent gases through four acoustical dampening chambers., Stainless Steel Wire Exhaust Port Gaskets and Heavy-Duty Hex Nuts - 65324-83-KW2 Genuine James. $22.46 Part #: 4403144 Mfg Part #: 65324-83-KW2. exact fit (15) Graphite Wire ... X-Series Exhaust System - 1074X Thunderheader. $1,656.00 Part …, Find many great new & used options and get the best deals for THUNDERHEADER EXHAUST PIPE MUFFLER 1970-1983 HARLEY SHOVELHEAD FLH FXE BIG TWIN at the best online prices at eBay! Free shipping for many products! ... item 4 STOCK HARLEY SHOVELHEAD EXHAUST PIPES WITH MUFFLERS FOR 1971-1978 FX FXE STOCK …, Harley-Davidson Screamin' Eagle Stage 4 with a ThunderHeader Exhaust System. Details, Test Ride, and freeway Shredding http://www.laidlawsharley.comSupport m..., New NOS Thunderheader Harley Davidson Chrome thunder header exhaust pipe 120134. Brand New: Thunderheader. $875.00. $46.00 shipping. 2010 Harley Davidson chrome exhaust muffler M286. Pre-Owned: Thunderheader. $60.00. $22.05 shipping. Thunderheader Black Thundercone Slip-On Muffler - 1069B (no ship to CA) (Fits: …, Exhaust Systems and Heat Shield Sets. Model 1071 THUNDERHEADER™ for 2010-2014 Touring. TRUE DUAL THUNDER™ for model years 2010-2016. Individual pipes for each cylinder and featuring our new Cross-Under™ design. Also a balance tube is incorporated in between primary tubes to improve torque., 1970-1983. Fits all models without floorboards. Sold Seperately - Heat Shields # 1088 (top rear), 1098 (top front), & 1090 (collector) 1020. 1020B. Heat Shield set of 3. 1120. 1120B. Thunderheader™ Exhaust Systems are legal for CLOSED-COURSE COMPETITION use only. , 1395 posts · Joined 2009. #5 · Nov 15, 2011. Fat cat hands down is best all around, i ran a thunder header for yrs, but got the money and got a better exhaust, thunder headers do well but usually have a nasty dip at around 2-2500 rpm and then pick back up. Have the dyno charts to prove the fat cat is smoother and higher output power and trq., 2-into-1 systems with patented collector design that directs spent exhaust gases in a spiral motion through four acoustical damping chambers. Exhaust travels through these chambers at high velocity to scavenge spent exhaust gases from the combustion chamber and bring in a fresh charge of air/fuel mixture. Anti-reversion design works to impede ..., THUNDERHEADER EXHAUST - FXR THUNDERHEADER. Ramjet's has been selling Thunderheaders for nearly 30 years! Shortly after being introduced to the market in the late '80s, Thunderheader 2:1 exh... View full details Original price $1,049.99 - Original price $1,099.99 Original price. $1,049.99 ..., When it comes to once-lucrative franchises, the strategy is to make more movies, ask questions later. Now that many of the biggest franchises in cinema history are either ending, o..., Description. Thunderheader X Series M8 Softail. Designed to give maximum horsepower without sacrificing low-end torque. 2-into-1 systems with patented collector design that directs spent exhaust gases in a spiral motion through four acoustical damping chambers. Exhaust travels through these chambers at high velocity to scavenge spent exhaust ..., Black Heat Shields for Thundercone Slip-Ons - 1166B Thunderheader. $187.20. Part #: 252134 Mfg Part #: 1166B. Results per Page. Viewing Results 1 - 7 of 7. Prev. Shop for Thunderheader Exhaust for your 2022 Harley-Davidson Road Glide Special - FLTRXS at Dennis Kirk., Thunderheader X-Series FLH/FLT M8. $1,448.00. Our X-SERIES™ Exhaust is our newest line in creating maximum horsepower. With our 2" headpipe, equal length tubes, and a larger collector, this exhaust is made specifically for Harley-Davidson's Milwaukee-Eight™ engine. Comes complete with full coverage heat shields, 18mm and 12mm O2 …, Harley-Davidson Screamin' Eagle Stage 4 with a ThunderHeader Exhaust System. Details, Test Ride, and freeway Shredding http://www.laidlawsharley.comSupport m..., Fits all Twin Cam DYNA models 1999-2005. Increased horsepower & unmistakable THUNDERHEADER™ sound. Year. Fitment. Chrome. Black. 1999-2005. Fits models with Center and Forward controls. Sold Seperately - Heat Shields 1094 (top rear), 1095 (top front), & 1090 (collector), Flowmaster Inc. The Performance Technology Company is a pioneer in the design, manufacturing and distribution of performance exhaust systems / kits for cars, pick-up trucks, muscle cars, foreign cars, SUVs, diesel trucks and many other vehicles. We have over 350 exhaust systems / kits available for different year, make and model applications., THUNDERHEADER EXHAUST - TOURING. by THUNDERHEADER. $1,437.99 - $1,919.99. From $129.79/mo with. Check your purchasing power. Ramjet's has been selling Thunderheaders for nearly 30 years! Shortly after being introduced to the market in the late '80s, Thunderheader 2:1 exhaust systems became THE performance exhaust system for your Harley-Davidson. , 1970-1983. Fits all models without floorboards. Sold Seperately - Heat Shields # 1088 (top rear), 1098 (top front), & 1090 (collector) 1020. 1020B. Heat Shield set of 3. 1120. 1120B. Thunderheader™ Exhaust Systems are legal for CLOSED-COURSE COMPETITION use only. , Description. Thunderheader X Series M8 Softail. Designed to give maximum horsepower without sacrificing low-end torque. 2-into-1 systems with patented collector design that directs spent exhaust gases in a spiral motion through four acoustical damping chambers. Exhaust travels through these chambers at high velocity to scavenge spent exhaust ..., The new THUNDERHEADER X-SERIES for Touring is our large diameter exhaust specifically designed for big cubic inch engines (107" and larger), built to produce big numbers. The X-SERIES is designed with 2" primary tubes with a 14 degree transition chamber to allow more exhaust flow. Our unique patented baffle in conjunction with our trademark ..., Black X-Series Exhaust System - 1073XB Thunderheader. $1,656.00. Part #: 4409870 Mfg Part #: 1073XB. Add to compare. Results per Page. Viewing Results 1 - 2 of 2. Prev. Shop for Thunderheader Exhaust for your 2024 Harley-Davidson Road Glide Limited - FLTRK at Dennis Kirk., The exhaust system is mounted to a rubber mounted powertrain then mounted to the frame with a rubber mount, a flat strap of steel and a little p-clamp. We're not dogging our friends at Thunderheader, the set up worked for a long time and it’s an inexpensive solution., An Executive Order (EO) is the document signed by an ARB official documenting ARB approval for specified motorcycles. Any aftermarket exhaust system that replaces or otherwise impacts emission control equipment, including catalytic converters, requires an EO to be sold for use in California unless the system is for competition use only ..., When it comes to bathroom ventilation, Fasco is a name that stands out. With their commitment to quality and innovation, Fasco bathroom exhaust fans have become a popular choice am..., Thunderheader 2 into 1 High Performance Exhaust System. ThunderHeader head pipes have been tuned to the proper length and diameter to produce maximum horsepower and a excellent torque curve. A patented collector is used. The collector is designed to direct spent gases through four acoustical dampening chambers., Free shipping. Thunderheader XSeries High Pipe 2 Into 1 Chrome Exhaust System Harley Softail M8. Brand New. $1,895.30. americanclassicmotors (374,510) 99.1%. Buy It Now. Free shipping. Black Cobra 2 Into1 PowerPro HP RPT Exhaust Header System Pipe Thunder Tone Dyna., Add-On Falsee System for X-SERIES - 1075XFB Thunderheader. $599.00. Part #: 4410982 Mfg Part #: 1075XFB. Add to compare. Results per Page. Viewing Results 1 - 9 of 9. Shop Thunderheader Mufflers/Slip-ons at Dennis Kirk. Best selection, low prices & orders over $89 ship free. We Ship Today! , An Executive Order (EO) is the document signed by an ARB official documenting ARB approval for specified motorcycles. Any aftermarket exhaust system that replaces or otherwise impacts emission control equipment, including catalytic converters, requires an EO to be sold for use in California unless the system is for competition use only ...