Sale

Exhaust Exhaust Pipes, Systems and Components

Flowmaster

American Thunder Crossmember-Back Exhaust System Fits 1970-1974 Chevrolet Camaro And Pontiac Firebird With V8 Engine 2.50 Inch Aluminized Steel Aggressive To Moderate Sound Flowmaster

$1,037.95 $949.95 Save $88.00

SKU: F00L 17149

In Stock
In Stock
Ships by Sep 16
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Flowmaster American Thunder exhaust system is a header-back dual exhaust kit. It is constructed from aluminized steel and features chambered mufflers. This kit includes an H-pipe and polished 304 stainless steel tips.
Show original supplier description

Part #: 17149

This American Thunder exhaust system comes as a complete true dual Crossmember-Back exhaust for your 1970-1974 Chevrolet Camaro or Pontiac Firebird with V8 engine. These dual systems feature 2.50-inch mandrel-bent aluminized steel tubing for maximum performance, includes a built-in H-pipe/balance tube flowing into a pair of Slimline 50 Series Delta Flow mufflers that deliver a moderate to aggressive interior and exterior tone and are suited to the enthusiast who wants their performance to be heard.The 2.50-inch tailpipes exit straight out under the rear bumper and are finished off with 2.50-inch angle-cut brushed stainless steel tips and includes all hangers and necessary hardware for installation. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Covered by our 3-year Limited Warranty.Specially Designed Slimline 50 Series Mufflers for Max ClearanceH-pipe Crossover for Maximum Power and Deep ToneModerate to Aggressive Sound Exterior Exhaust NoteIncludes 2.50-inch Polished 304 Stainless Steel TipsMandrel-bent 16-gauge Aluminized Steel TubingIncludes Hangers and Hardware for InstallationCrossmember-Back True Dual Exhaust SystemDoes Not Include Header Reducers or Factory Manifold Downpipes

Features:

  • Specially Designed Slimline 50 Series Mufflers for Max Clearance
  • H-pipe Crossover for Maximum Power and Deep Tone
  • Moderate to Aggressive Sound Exterior Exhaust Note
  • Includes 2.50-inch Polished 304 Stainless Steel Tips
  • Mandrel-bent 16-gauge Aluminized Steel Tubing
  • Includes Hangers and Hardware for Installation
  • Crossmember-back True Dual Exhaust System
  • Does Not Include Header Reducers or Factory Manifold Downpipes

Exhaust System - American Thunder - Header-Back - 2-1/2 in Diameter - Dual Rear Exit - 2-1/2 in Polished Tips - Steel - Aluminized - GM F-Body 1970-74 - Kit

This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

Vehicle Symptoms
  • Rust holes or rotted exhaust pipes under the car
  • Exhaust leak causing loud ticking or hissing sound
  • Decreased engine power and fuel economy
  • Interior smells of exhaust fumes
  • Old exhaust system sounds rattly or weak
Relevant Conversations
  • 1970 Camaro exhaust system upgrade recommendations
  • Flowmaster American Thunder sound clips for Firebird
  • Best dual exhaust kit for 1973 Camaro
  • Exhaust leak fix for 1974 Pontiac Firebird
  • Compare Flowmaster vs Magnaflow for classic Camaro
  • How to install header-back exhaust on 1972 Camaro
  • Need new exhaust for my 1971 Firebird V8
  • American Thunder Flowmaster 17149 review
  • Will Flowmaster 50 series fit 1970 Camaro?
  • Rusty exhaust pipe replacement for 1974 Firebird

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandFlowmaster
Part NumberF00L 17149

About MOTORMIA

5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy