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Flowmaster

Flowmaster Chevrolet Nova Base 7.4L American Thunder Kit

MPN: 817158 Catalog #: 001083782 Category: Catback Check Vehicle Fitment

Product Details

Flowmaster Chevrolet Chevy II Nova 6.5L American Thunder Kit, Flowmaster Chevrolet Chevy II Nova 5.3L American Thunder Kit, Flowmaster Chevrolet Chevy II Nova 5.0L American Thunder Kit, Flowmaster Chevrolet Nova Base 6.5L American Thunder Kit, Flowmaster Chevrolet Nova Base 5.0L American Thunder Kit, Flowmaster Chevrolet Nova Base 6.5L American Thunder Kit, Flowmaster Chevrolet Nova Base 7.4L American Thunder Kit, Flowmaster Chevrolet Nova Base 6.6L American Thunder Kit, Flowmaster Chevrolet Nova Custom 5.0L American Thunder Kit, Flowmaster Pontiac Ventura Base 5.0L American Thunder Kit, Flowmaster Pontiac Ventura Base 5.7L American Thunder Kit, Flowmaster Pontiac Ventura Custom 5.0L American Thunder Kit, Flowmaster Pontiac Ventura Custom 5.7L American Thunder Kit, Flowmaster Pontiac Ventura GTO 5.7L American Thunder Kit

Flowmaster Chevrolet Chevy II Nova 6.5L American Thunder Kit, Flowmaster Chevrolet Nova Base 7.4L American Thunder Kit, Flowmaster Pontiac Ventura Custom 5.7L American Thunder Kit

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.

SPECS

Header-back System 409S -Dual Rear Exit - American Thunder - Moderate/Aggressive

Exhaust System - American Thunder - Header-Back - 2.5 in Diameter - Dual Rear Exit - Stainless - Natural - Chevy V8 - GM X-Body 1968-74 - Kit

1970–1972 Flowmaster Chevrolet Nova Base 6.6L American Thunder Kit

1969–1973 Flowmaster Chevrolet Nova Base 5.0L American Thunder Kit

1970 Flowmaster Chevrolet Nova Base 6.5L American Thunder Kit

1969 Flowmaster Chevrolet Nova Base 6.5L American Thunder Kit

1973 Flowmaster Chevrolet Nova Custom 5.0L American Thunder Kit

Flowmaster Pontiac Ventura Base 5.0L American Thunder Kit

Header-back System 409S -Dual Rear Exit - American Thunder - Moderate/Aggressive

Flowmaster Chevrolet Chevy II Nova 6.5L American Thunder Kit, Flowmaster Chevrolet Chevy II Nova 5.3L American Thunder Kit, Flowmaster Chevrolet Chevy II Nova 5.0L American Thunder Kit, Flowmaster Chevrolet Nova Base 6.5L American Thunder Kit, Flowmaster Chevrolet Nova Base 5.0L American Thunder Kit, Flowmaster Chevrolet Nova Base 6.5L American Thunder Kit, Flowmaster Chevrolet Nova Base 7.4L American Thunder Kit, Flowmaster Chevrolet Nova Base 6.6L American Thunder Kit, Flowmaster Chevrolet Nova Custom 5.0L American Thunder Kit, Flowmaster Pontiac Ventura Base 5.0L American Thunder Kit, Flowmaster Pontiac Ventura Base 5.7L American Thunder Kit, Flowmaster Pontiac Ventura Custom 5.0L American Thunder Kit, Flowmaster Pontiac Ventura Custom 5.7L American Thunder Kit, Flowmaster Pontiac Ventura GTO 5.7L American Thunder Kit

SPECS

  • Engine Liter: 7.4
  • CC: 7439
  • CID: 454
  • Quantity: 1

Header-back System 409S -Dual Rear Exit - American Thunder - Moderate/Aggressive

Vehicle Fitment

Please verify year, make, model, and any notes before ordering.

Product Specs

Brand
Flowmaster
Part Number
817158
Catalog Number
001083782
Product Line
American Thunder Kit
Category
Exhaust
Type
Catback
UPC / Barcode
700042025626
Length
52.50 in
Width
16.00 in
Height
14.75 in
Weight
61.00 lb
Ship Alone
Yes
Air Restricted
No

Shipping & Availability

Current status 1 Available - Ready to ship
Estimated timing Usually ships within 24hrs

This item is showing available inventory. Most in-stock performance parts ship quickly, but timing can vary by warehouse, vendor cut-off time, holidays, and carrier pickup.

Inventory shown: 1 available as of 6/4/2026.

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