Sale

Exhaust Exhaust Pipes, Systems and Components

Flowmaster

American Thunder Cat-Back Exhaust System Fits 2005-2010 Ford Mustang Gt, Gt500, California Special Or Convertible With 4.6L Or 5.4L Engine 3.00-Inch Mandrel Bent Pipes With Scavenger Series X-Pipe Aggressive Sound Flowmaster

$1,574.95 $1,449.95 Save $125.00

SKU: F00L 817494

In Stock
In Stock
Ships by Sep 20
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Flowmaster American Thunder Cat-back Exhaust System is designed for 2005-2010 Ford Mustang GT, GT500, California Special, or convertible models with a 4.6L or 5.4L engine. This system features 3.00-inch mandrel-bent tubing made from 16-gauge stainless steel. It incorporates a Scavenger Series X-pipe and Flowmaster's 60 Series performance mufflers.
Show original supplier description

Part #: 817494

For the serious enthusiast who is looking for all the performance benefits of a complete Cat-back dual exhaust system, this is it. As an American Thunder system, it delivers an aggressive exterior sound level and a moderate interior tone that is suited to the enthusiast who wants to be heard. With maximum performance and easy fit in mind, the system is mandrel bent and includes specially engineered mufflers featuring Delta Flow technology. A Scavenger Series X-pipe is used to maximize exhaust pulse velocity for better torque and helps keep that classic muscle car tone. Maximum increases of 17 hp and 19 ft-lb. torque at the rear wheels. 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 a simple installation.

Features:

  • 3.00-inch Mandrel-bent 16-gauge Stainless Steel Tubing
  • Mandrel Bent 16ga 409 Stainless Tubing
  • Includes Hangers and Hardware for an Easy Installation
  • Includes Hangers And Hardware For Easy Installation
  • Scavenger Series X-pipe Crossover for Maximum Power
  • Dyno Tuned for Maximum Performance
  • Specially Designed 60 Series Performance Mufflers
  • Premium Flowmaster Quality
  • Large 4.00-inch Polished Stainless Steel Tips
  • 3 Year Limited Warranty
  • Connects After Factory Catalytic Converter
  • Made in the USA
  • Aggressive Sound Exterior Exhaust Tone
  • Uses the Factory Hanger Locations

American Thunder Cat Back Exhaust System | Dual | Dual Rear Exit | Incl. 3.0 in. Tubing/Special Build 60 Series (TM) Mufflers/Scavenger X-Pipe/4.0 in. Polished Stainless Tips

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

Vehicle Symptoms
  • factory exhaust too quiet on acceleration
  • want deeper aggressive exhaust tone
  • looking for noticeable power gains on Mustang GT
  • stock cat-back rusted or corroded
  • existing aftermarket exhaust drones at highway speed
Relevant Conversations
  • 2005 Mustang GT Flowmaster American Thunder cat-back sound clip
  • Flowmaster 817494 vs Pypes exhaust Mustang GT
  • American Thunder cat-back install time 2005 Mustang GT
  • Will Flowmaster American Thunder pass emissions test
  • best cat-back exhaust for 2005-2010 Mustang GT
  • Flowmaster American Thunder highway drone review
  • Mustang GT exhaust upgrade before dyno tune
  • American Thunder 60 series muffler with long tube headers
  • does 817494 fit 2008 Mustang GT automatic
  • Flowmaster American Thunder vs Gibson cat-back Mustang

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 817494

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