Flowmaster 817129 | Exhaust System Kit

Part Number
American Thunder Header Back Exhaust System| Dual| Dual Side Exit| Incl. 2.5 in. Tubing/Super 44 Series Mufflers/H-Pipe/Hardware| 409 Stainless Steel

Fits: 67-68 Chevrolet Camaro, 67-68 Pontiac Firebird

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For the person looking for a complete Header-back dual exhaust system with an aggressive tone. With easy fit in mind, Flowmaster's America Thunder system for GM F-Body cars include specially-selected Super 44 mufflers to make your Camaro or Firebird come alive. This Header-back dual exhaust system uses 2.50 in. 409S stainless steel tubing! And a durable H-pipe design that delivers improved throttle response, power and mileage. American Thunder systems deliver a moderate to aggressive interior and exterior tone and are suited to the enthusiast who wants their performance to be heard. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation.

BRAND: Flowmaster


  • Fits 1967 to 1968 GM F-Body with a V8 engine.
  • Header Back|Exhaust|Kit|Camaro|Firebird|Performance
  • Holley Performance Emission Code 3: This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles and Racing Use Only Vehicles. The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles: 1965 and older U.S. manufactured California Certified vehicles/1967 and older U.S. manufactured Federally Certified vehicles/1967 and older Foreign manufactured vehicle. The following vehicles are considered Racing Use Only Vehicles: Racing Use Only Vehicles are vehicles that are used exclusively for competition and that are not registered and that may never be used on the street. WARNING: It is against the law to install this part on an Emissions Controlled Vehicle. The following vehicles are considered Emissions Controlled Vehicles: 1966 and newer U.S. manufactured California Certified vehicles/1968 and newer U.S. manufactured Federally Certified vehicles/1968 and newer Foreign manufactured vehicle
  • Exhaust System Kit
  • Header Back System
  • Mandrel Bent 16ga 409 Stainless Tubing
  • Premium Flowmaster Quality
  • Header-back 409S 67-68 GM
  • American Thunder Header Back Exhaust System
  • Dyno Tuned for Maximum Performance
  • Limited Lifetime Warranty
  • American Thunder Header Back Exhaust System| Dual| Dual Side Exit| Incl. 2.5 in. Tubing/Super 44 Series™ Mufflers/H-Pipe/Hardware| 409 Stainless Steel|
  • Dual Rear Exit
  • Incl. Hangers and Hardware For Easy Installation
  • Moderate to Aggressive Exterior Exhaust Tone


California Proposition 65 Chemical Name 1Nickel (metallic)
California Proposition 65 Chemical Name 2Chromium (hexavalent compounds)
Exhaust SeriesAmerican Thunder
Exhaust TypeDual
Exit PositionDual Side
Exit StyleStraight
Heat Shield AttachedNo
Inlet Diameter2.500 in.
Inlet Inside DiameterN/A
MaterialStainless Steel
Muffler Count2
Muffler Part Number842546
Muffler SeriesSuper 44 Series
Outlet Diameter2.500 in.
Outlet Outside Diameter2.500 in.
Single or DualDual
Sound LevelModerate/Aggressive
System TypeHeader Back
Tail Pipe Diameter2.500 in.
Tip DiameterN/A
TitleFlowmaster 817129 Header-back System - Dual Side Exit - American Thunder - Aggressive Sound
Tubing Diameter2.500 in.
WARNING CA Proposition 65Yes
WARNING CA Proposition 65 MessageWARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Dual| Dual Side Exit| Incl. 2.5 in. Tubing/Super 44 Series(TM) Mufflers/H-Pipe/Hardware| 409 Stainless Steel|Legal On Non-Emissions Controlled Vehicles Or For Race Use Convertibles Require Aftermarket X-Brace Or 3/8 in. Shims For Clearance



    • Flowmaster: 17129
    • MagnaFlow Exhaust Products: 15899
    • MagnaFlow Exhaust Products: 15896


    • 1967-1968 Pontiac Firebird
    • 1967-1968 Chevrolet Camaro
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