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American Racing Headers 1-5/8 in. Long Tube Headers w/ Catted X-Pipe (99-04 GT)

Item 404099
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Ship to: Ashburn - 20149
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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Long Tube Header Exhaust System
      • Increase Your Mustang’s Horsepower and Torque
      • 304 Stainless Steel
      • Laser-Cut Intake Flanges
      • Hand-Ported Inlets
      • High-Quality Cats
      • Merge Collectors
      • Advanced Installation
      • Limited Lifetime Warranty
      • Fits all 2011-2014 Ford Mustang GT Models


      Heads Up – More Power Incoming. Your 1999-2004 Ford Mustang GT is a beast compared to other, lesser cars. However, your system gets pretty stale if you can’t find the right aftermarket components to improve it. So make sure you get the best with the American Racing Headers 1-3/4 in. Long Tube Headers w/ Catted X-Pipe. The powerful combination of design and construction gives you an impressive boost of power that’s also street-legal, so you can turn heads on the track and off.

      Stainless Steel Construction. This exhaust system is built from 304 stainless steel, the most durable material available for exhaust systems. They’re resistant to corrosion and heat and are able to put up with the stresses of the road and the track.

      Custom Components. The 3/8” flanges on the headers are laser-cut for accuracy and precision. You’re going to feel the increased horsepower and torque of your Mustang as you’re ripping up the track, thanks to its merge collectors and hand-ported inlets.

      Catted X-Pipe. The mid pipe on this exhaust is protected by its 200-cell metallic substrate catalytic converter, helping you reduce emissions while also keeping your performance high. It’s a very durable cat that will last you for a very long time.

      Installation. Advanced mechanical expertise is required to install this set. Access to a car lift is recommended, but jack stands will work as well. Please allow about four hours to install this with normal hand tools and maybe a friend to help with holding the pipes in place.

      Limited Lifetime Warranty. This exhaust system is covered by American Racing Header’s limited lifetime warranty, protecting against material and workmanship defects. See American Racing Headers full warranty for more details.

      Application. This American Racing Headers 1-5/8 in. Long Tube Headers w/ Catted X-Pipe is designed to fit 1994-2004 Ford Mustang GT models. Please ensure correct model before purchase.

      Fitment: 1999 2000 2001 2002 2003 2004 Details

      MPN# MT2-99158212LSWC

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (2)

      Write a Review

      Ratings Summary

      5.0 out of 5 overall rating from 2 customers

      Installation Time: Afternoon

      • November 07, 2019

        5 2004 GT - Robb1966


        Very nice product, tone is perfect. Delivery is always good at AM.

        Helpful (2)
      • October 19, 2018

        5 2004 GT - AnthonyR Installation Time: Afternoon

        Great mod!

        The product was great and it really gives my 2004 Gt a boost greatly recommended!

        Helpful (14)

      Questions & Answers (3 answers)

      3 Top Rated Questions

      Will t fit a 2004 mustang gt with automatic?

      • This American Racing Headers 1-5/8 in. Long Tube Headers w/ Catted X-Pipe is designed to fit 1994-2004 Ford Mustang GT equipped with either a manual or automatic transmission.

      Helpful (4)

      Is a tune required for these headers?

      • Yes a custom tune is required for these headers.

      Helpful (0)

      Will this pass emissions in city limits?

      • We cannot advise on local emissions in your area, and would suggest speaking to local officials regarding emissions testing. This is not 50 state CARB legal.

      Helpful (0)
      Post Your Question

      Installation & What's in the Box

      What's in the Box

      • (2) Long Tube Headers
      • (2) Connection Pipes
      • (1) Catted Mid Pipe

      Will It Fit My Mustang

      • Bullitt - 01
      • GT - 99, 00, 01, 02, 03, 04

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