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Flowmaster 817158 American Thunder Exhaust Kit, 1968-74 Nova
Flowmaster 817158 American Thunder Exhaust Kit, 1968-74 Nova

Flowmaster 817158 American Thunder Exhaust Kit, 1968-74 Nova

73-74 Apollo, 1968 Chevy II, 69-74 Nova, 73-74 Omega, 71-74 Ventura, 2.5" Tube O.D.

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Flowmaster 817158 American Thunder Exhaust Kit, 1968-74 Nova
Flowmaster 817158 American Thunder Exhaust Kit, 1968-74 Nova
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We estimate this item will ship on or before July 24th.
Part # 378817158
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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
Outlet Location:
Dual Rear
Outlet Size:
MFG. Part #:
GTIN Code:
Heat Shield:
Muffler Quantity:
Muffler Series:
Super 44 Series
Single or Dual:
Sound Level:
Moderate/Aggressive Sound
Exhaust System Type:
Header-back System


For the person who is looking for a complete Header-back dual exhaust system with an aggressive tone. These systems are mandrel bent for maximum performance and include specially selected mufflers. 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.

  • Mandrel bent 16 gauge stainless steel tubing
  • Aggressive Sound Exterior Exhaust Tone
  • Includes hangers and hardware for easy installation
  • Header-back System

Installation Instructions (PDF)


1969-1970 Chevrolet Nova 396 CID/6.5L V8
1970-1971 Chevrolet Nova 454 CID/7.4L V8
1970-1972 Chevrolet Nova 402 CID/6.6L V8
1969-1973 Chevrolet Nova 307 CID/5.0L V8
1971-1973 Pontiac Ventura 307 CID/5.0L V8
1973-1974 Buick Apollo 350 CID/5.7L V8
1969-1974 Chevrolet Nova 350 CID/5.7L V8
1973-1974 Oldsmobile Omega 350 CID/5.7L V8
1971-1974 Pontiac Ventura 350 CID/5.7L V8
1968 Chevrolet Chevy II 307 CID/5.0L V8
1968 Chevrolet Chevy II 327 CID/5.3L V8
1968 Chevrolet Chevy II 350 CID/5.7L V8
1968 Chevrolet Chevy II 396 CID/6.5L V8


Fits 1968 to 1974 Chevrolet Nova with a V8 engine.
Some parts are not legal for use in California or other states with similar laws/regulations

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