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.
Flowmaster 817158 American Thunder Exhaust Kit, 1968-74 Nova Flowmaster
Flowmaster 817158 American Thunder Exhaust Kit, 1968-74 Nova
Sku # 378817158
Mfr. Part # 817158
Condition
New
Brand
Flowmaster
Sold
Kit
Details
Info

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
Application
This Part Fits
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
Charts

(PDF)

Installation Tips
Fits 1968 to 1974 Chevrolet Nova with a V8 engine.
This item is being shipped to you directly from the manufacturer and is subject to an increased handling time. Delivery estimates that include the handling time are displayed on the "Shipping and Payments" tab.
Specs
Sold in Quantity
Kit
Hardware Included
Yes
Drivetrain
2WD
Catalytic Converter(s) Included
No
MFG. Part #
817158
GTIN Code
700042025626
Single or Dual
Dual
Heat Shield
No
Muffler Quantity
2
Inlet Size
2.50"
Outlet Size
2.50"
Tailpipe Diameter
2.5
Inlet Quantity
Dual
Exhaust System Type
Header-Back
Exhaust Exit
Dual Split Rear
Sound Level
Moderate/Aggressive
Exhaust System Material
409S Stainless Steel
Exhaust System Finish
Natural
Exhaust Pipe Color
Natural
Muffler Series
Super 44 Series
Muffler Connections
Single Inlet | Single Outlet
Muffler Material
409 Stainless Steel
Muffler Color
Natural
Exhaust Tip Color
Natural
Exhaust Tip Quantity
0
Muffler(s) Included
Yes
Exhaust Tip Included
No
Exit Location
Rear
Exhaust Tubing Diameter
2-1/2 Inch
Tech Support
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About
Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 72 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.