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Flowmaster 817571 American Thunder Exhaust Kit, 1975-81 GM F-Body
Flowmaster 817571 American Thunder Exhaust Kit, 1975-81 GM F-Body

Flowmaster 817571 American Thunder Exhaust Kit, 1975-81 GM F-Body

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Flowmaster 817571 American Thunder Exhaust Kit, 1975-81 GM F-Body
Flowmaster 817571 American Thunder Exhaust Kit, 1975-81 GM F-Body
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We estimate this item will ship on or before March 20th.
Part # 378817571
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Important Messages:

  • This item ships directly from the manufacturer. It may take an additional 2 business days for Flowmaster to ship this item.
  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
  • This item ships via Ground Shipping only. Expedited and Air shipping options are not available.


Tube O.D.:
Material Type:
Stainless Steel
Inlet Size:
Outlet Location:
Dual Side
Outlet Size:
MFG. Part #:
GTIN Code:
Heat Shield:
Muffler Quantity:
Muffler Series:
50 Series Slim Line
Sound Level:
Moderate/Aggressive Sound
Exhaust System Type:
Header-back System


For the person looking for a complete Header-back dual exhaust system with an aggressive tone. With easy fit in mind, Flowmaster's American Thunder system for GM F-Body cars include specially-selected 50 series slim-line mufflers to make your Camaro or Firebird come alive. This Header-back dual exhaust system uses 2.50 in. 409S stainless steel tubing (backed by our lifetime limited warranty!) 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. Note 1- Off Road racing use only - not legal for use on catalyst equipped vehicles. Note 2- requires double hump crosspipe. Note 3- requires fabrication and/or welding to adapt system to manifolds or headers.

  • Stainless Steel Construction
  • Dyno tuned for maximum performance
  • Patented Delta Flow technology
  • Lifetime limited warranty

Installation Instructions (PDF)


1975-1976 Pontiac Firebird 455 CID/7.5L V8
1975-1979 Pontiac Firebird 350 CID/5.7L V8
1975-1979 Pontiac Firebird 400 CID/6.6L V8
1977-1979 Pontiac Firebird 403 CID/6.6L V8
1976-1981 Chevrolet Camaro 305 CID/5.0L V8
1975-1981 Chevrolet Camaro 350 CID/5.7L V8
1980-1981 Chevrolet Camaro 4.4L V8
1977-1981 Pontiac Firebird 301 CID/4.9L V8
1977-1981 Pontiac Firebird 305 CID/5.0L V8
1981 Pontiac Firebird 4.3L V8


Fits 1975 to 1981 GM F-Body with a 4.4L, 4.9L, 5.0L, 5.7L, 6.6L, or 7.5L engine, for Off Road Use Only, includes Camaro and Firebird
Some parts are not legal for use in California or other states with similar laws/regulations

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