Sale

Exhaust Exhaust Pipes, Systems and Components

Flowmaster

American Thunder Cat-Back Exhaust System 1999-2004 Ford Mustang Gt, Mach1 And Bullitt With 4.6L Sohc Engine, Stainless Steel Aggressive To Moderate Sound Flowmaster

$1,140.95 $1,049.95 Save $91.00

SKU: F00L 817312

In Stock
In Stock
Ships by Sep 14
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

An aggressive sounding cat-back exhaust system featuring Super 40 Series Mufflers, 3" polished stainless steel tips, and mandrel-bent 409 stainless steel construction.
Show original supplier description

Part #: 817312

For the person who is looking for a complete Flowmaster cat-back dual exhaust system with an aggressive tone. With easy fit in mind, this American Thunder exhaust system features mandrel-bent 2.50-inch stainless steel tubing for maximum performance and includes a pair of specially selected Super 40 Series performance mufflers.The custom tailpipes feature added clearance and exit in the factory location with large 3.00-inch polished tips. The system uses the factory hanger locations for an easy install and delivers a moderate to aggressive interior and exterior tone, best suited to the enthusiast who wants their performance to be heard. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage and are designed for an easy fit. The system includes all necessary parts, hardware and instructions for an easy installation you can do at home.Includes Hangers and Hardware for an Easy InstallationMandrel-bent 16 Gauge Stainless Steel Tubing3.00-inch Polished 304 Stainless Steel TipsDyno Tuned for Maximum PerformanceSuper 40 Series Performance MufflersUses the Factory Hanger LocationsModerate Exterior Exhaust ToneLifetime Limited Warranty

Features:

  • Includes Hangers and Hardware for an Easy Installation
  • Mandrel Bent Tubing
  • Mandrel-bent 16 Gauge Stainless Steel Tubing
  • Includes Hangers And Hardware For Easy Installation
  • 3.00-inch Polished 304 Stainless Steel Tips
  • Dyno Tuned for Maximum Performance
  • Dyno Tuned for Maximum Performance
  • Premium Flowmaster Quality
  • Super 40 Series Performance Mufflers
  • 3 Year Limited Warranty
  • Uses the Factory Hanger Locations
  • Made in the USA
  • Moderate Exterior Exhaust Tone
  • Lifetime Limited Warranty

American Thunder Cat Back Exhaust System | Dual | Dual Rear Exit | Incl. 2.5 in. Tailpipes/Super 40 Series (TM) Mufflers/3.0 in. Stainless Tips | 409 Stainless Steel

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

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 817312

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