Flowmaster® (05-10) Mustang GT/GT500 409SS 2.5" Cat-Back System with Mufflers

  • Sale
  • Regular price $698.95

Compatible: (4.6L/5.4L)

2005 - 2010 Ford Mustang GT/GT500


This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

This Flowmaster® Outlaw® Cat-back exhaust system is designed for 2005-2010 Ford Mustang GT 4.6L, and GT500 with 5.4L engine and is perfect for the person looking for a deep aggressive sound level both inside and outside the car. This bolt-on emissions-legal system features 2.50-inch mandrel-bent stainless steel tubing leading into a pair of our race-proven Outlaw Series mufflers with large 3.00-inch outlets for maximum performance. The system uses the factory hanger locations for easy installation and is finished off with a pair of large 4.00-inch polished stainless steel tips embossed with the Flowmaster logo. This exhaust system fits both coupes and convertibles and is covered by our Lifetime Limited Warranty. Includes all necessary parts, hardware and easy to follow instructions for an installation you can do at home. Note: Fits coupes and convertibles.


  • Mandrel-bent Stainless Steel Construction
  • Deep Aggressive Interior/Exterior Sound
  • Dyno Tuned For Maximum Performance
  • Race-proven Outlaw Mufflers
  • Lifetime Limited Warranty
  • Flowmaster Quality
  • Easy Installation


Brand Flowmaster
Catalytic Converter Included No
Emission Code 5
Exhaust Series Outlaw
Exit Position Dual Out Rear
Heat Shield No
Material 409 Stainless Steel
Mount Type Uses Factory Hangers
Muffler Finish Black
Muffler Inlet Diameter (in) 2.5
Muffler Material 409S Stainless Steel
Muffler Outlet Diameter (in) 3
Muffler Part Number Kit Only
Muffler Quantity 2
Muffler Series Outlaw
Muffler Shape Round
Muffler Type Welded Baffle
Product Type Exhaust System
Single Dual Dual
Sound Level Aggressive
System Type Cat-back
Tip Cut Angle
Tip Diameter (in) 4
Tip Edge Style Rolled
Tip Finish Polished
Tip Length (in) 5.25
Tip Logo Embossed
Tip Material 304 Stainless
Tip Quantity 2
Tip Shape Round
Tubing Diameter (in) 2.5
Tubing Material 409S Stainless Steel
California Proposition 65 Chemical Name Chromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 Required Yes
Part Number 817515

Install Guide: