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Magnaflow Off-Road Tru-X X-Pipe (99-04 4.6L)

Item 48003
AmericanMuscle no longer carries the Magnaflow Off-Road Tru-X X-Pipe (99-04 4.6L). Please check out Home for an updated selection.
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    Product Information

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


    • Improves exhaust flow for more power
    • Raspy Race Car Growl
    • For off-road, track use
    • 2.5" mandrel bent stainless steel tubing
    • Fits 99-04 GT, Bullitt, Mach 1 & SVT Cobras


    Improves Exhaust Flow. Replace those power robbing factory catalytic converters and release hidden power with a Magnaflow Off-road X-Pipe. Featuring a Tru-X "X" style crossover and free-flowing mandrel-bent piping, this high performance x-pipe dramatically improves exhaust flow. Magnaflow's Off-road X-pipe out performs the restrictive stock catted H-pipe by producing more horsepower and torque at the rear wheels.

    Race Car Growl. This free flowing Magnaflow Tru-X X-pipe for the 1999 to 2004 Mustang's not only increases power, but with its modern "X" crossover pipe design it also adds a crisp raspy, race car growl to the sound of your exhaust.

    Magnaflow High Flow Construction. Magnaflow uses free-flowing 2.5" mandrel bent stainless steel tubing that has a consistent diameter throughout the entire length of the pipe, even at the bends to provide excellent exhaust flow that results in more power at the rear wheels.

    Application. This Magnaflow Tru-X Off-road X-pipe is designed as a direct bolt-on for the 1999-2004 GT, 2001 Bullitt, 2003-2004 Mach 1 and 1999-2004 SVT Cobra with either aftermarket short tube headers or the stock manifolds and a dual catback exhaust installed. Intended for off-road, track use only, does not include catalytic converters.

    Note: Coupon codes cannot be applied to this product.

    Technical note: 2004 Mustangs require the use of 24" O2 sensor plug-in extender wires. This Magnaflow product is intended for off road use, and is not legal for use in emission restrictive states.


    CA Residents: WARNING: Cancer and Reproductive Harm -


    Customer Reviews (32)

    Write a Review

    Ratings Summary

    4.9 out of 5 overall rating from 32 customers

    Installation Time: Afternoon

    Installation Cost: $100-$250

    • August 17, 2013

      5 2004 GT - John718 Installation Time: Less than 1 Hour

      O/r tru x pipe

      I received this x pipe in 3 days and installed them myself using a lift. It took me about an hour and god **** this exhaust is loud lol the car even felt a noticeable gain I have these paired with a magnaflow magnapack catback reall throaty and deep. sounds like raging elephants at 3000 rpm it's crazy. Just a word of advice u will need a flange for passenger side connecting to headers.

      Helpful (4)
    • November 30, 2012

      5 2001 GT - Danny13 Installation Time: Shop Install Installation Cost: $100-$250

      Excelent product! Sounds great!

      I recieved this o/r x-pipe for my 17th birthday from my dad and I couldn't be any happier. The sound is great; has that deep muscle car idle and a mean scream at throttle wide open even with the stock cat back exhaust. Matched with a bbk cold air intake I can feel the power beneath my foot especially between 3000 and 4500 rpms. Highly recommend it!

      Helpful (4)
    • September 27, 2012

      5 2002 GT - SsBuiltNinja Installation Time: Less than 1 Hour

      A beast of a sound !

      Simply amazing ! the air flow and volume is way sounds amazing and doesent have a rhaspy sound. It fits right up to a stock system if you are just purchasing the x pipe. I went with bbk shorty headers, magnaflow tru x x pipe and magnaflow catback system. Magnaflow makes an AMAZING product, has a great sound, and added a huge h/p performance over my stock system.

      Helpful (5)
    • August 15, 2012

      5 2004 Cobra - 04cobrawoo Installation Time: Less than 1 Hour

      paired with magnaflow catback 04 cobra! amazing

      couldnt have asked for a better fit, this tru-x replaced my bbk garbage x pipe and the quality right off the bat is much better. the rasp created from this x pipe is perfect right between 2-3k rpm. would definately suggest to buy it.

      Helpful (4)
    • August 09, 2012

      5 1999 Cobra - 99s2Fast4U Installation Time: Less than 1 Hour

      Holy S***

      This is by far the loudest exhaust system i have ever heard, when people on here say it will wake the dead there not lying. The best part is bama came through with a new custom tune to turn off O2 codes, no check engine light for me, but if your going to buy this get ready for tickets and a lot of smog. all and all very good product, would buy it again if i had to.

      Helpful (5)
    • July 07, 2012

      5 2003 Mach 1 - moosemike Installation Time: Less than 1 Hour

      Best x pipe

      I've had several runs with different exhaust systems and this on right here is the best sounding exhaust system I've purchased it's so nice fits well sound is impeccable.

      Helpful (4)
    • June 18, 2012

      5 2003 GT - MSPD135 Installation Time: Less than 1 Hour

      Magnaflow X

      I decided to purchase this X because I had Magnaflow Axel Backs already. I must say it's a great sounding combo! Above 2K RPM's it has that classic stang sound, that raspy eat your face growl. Personally, I don't consider this combo to be very loud. It's got a great tone and the volume is just perfect. When cruising in 5th gear you can barely hear it inside the cabin. When you step on it people definitely hear you coming. I purchased the MIL Eliminators along with the X and at approximately 90 Miles later, no engine lights. Great product American Muscle!!!

      Helpful (3)
    • April 29, 2012

      5 2003 Cobra - King03Cobra Installation Time: Afternoon

      Amazing Fit

      I have a 03 Cobra, and this is my 2nd pipe, had the Summit brand, didn't fit was about 10" longer then the stock pipe, this was easy install took me less then 90 mins to take the stock pipe out and put this one in, was the exact same measurements as the stock one, bolted right in, didn't have to replace the flange studs, no leaks as well, good buy for a terminator.

      Helpful (4)
    • March 05, 2012

      4 2004 GT - GANGSTANG04 Installation Time: Less than 1 Hour

      04 mustang gt will need 02 extentions on rear 02 scenors also gasket for header on passenger side

      04 mustang will need o2 scencor extention on drivers side its about six inches too short. Also you will need to buy a gasket for the header to the x pipe on the passenger side. The install was very easy took less than a hour, The hard part was getting the bolts off the stock h pipe to the header NEEDED TO USE HEAT TO BREAK THEM LOOSE. American Muscle is the best very fast shipping and very good price i wouldnt buy my mustang parts anywhere else!!!!

      Helpful (3)
    • February 27, 2012

      5 2000 GT - Dmax Installation Time: Shop Install

      A Must Have

      immediately felt performance increase and sounds absolutely nasty. highly recommended

      Helpful (3)

    Questions & Answers (9 answers)

    5 Top Rated Questions

    Do I need O2 extensions with this x-pipe for my 2002 GT?

    • No but your probably going to need the mil eliminators if you go with the off road x-pipe.

    Helpful (1) Show 1 more answer

    Transmission? Is this compatible with either a manual or automatic transmission?

    • This X Pipe is designed for manual or automatic.

    Helpful (0) Show 1 more answer

    Does this work with a V6? I have a V6 that I'm putting a GT engine in, will this work for me?

    • With a 4.6L engine (like the 2003 GT), given that the pipes fit the frame of the undercarriage, this will work with your car.

    Helpful (0)

    O2 extension needed for my 04 mustang ? I have an 04 mustang gt and bought some magnaflow off-road x-pipe I'm going to install it with stock headers and was told that I was ganna need mil eliminators and o2 extensions ? Will the mil eliminators do the job to extend the space needed or will I have to purchase both mil eliminators and o2 extensions ?

    • My friend has a 04 GT as well, he needed both MIL eliminators and extenders when he installed his x pipe.

    Helpful (0) Show 1 more answer

    Horsepower gain ? How many horsepower will a magna flow x-pipe will it gain on 04 mustang gt ?

    • This x-pipe, by itself should net a 10-15 horsepower gain. Coupled with other mods, such as a CAI and a BAMA tune, you should expect anywhere from 25-30 hp.

    Helpful (0) Show 2 more answers
    Post Your Question
    4 More Questions
    longtube headers Would these work with long tube headers even though it says to go with shortys and if it doesnt work what shortys headers would be best? 3 answers
    which off road pipe produces the most hp for a 01 gt the x-pipe or the h-pipe? years ago i put an h-pipe on my 87 gt and i really could fill the differance. i was wondering if anyone had ever did a comparison of the x-pipe to the h-pipe? 2 answers
    what is the mil eliminater? i want to buy an x-pipe but dont have a tune will the mil eliminater keep me from getting a check engine light? 3 answers
    Do i need mil eliminators if i have a bama tune? 2 answers

    Installation & What's in the Box

    Installation Info

    What's in the Box

    • (1) X-pipe

    Tech Specs

    Mid Pipe Specifications
    Style Mid Pipe: Standard length "X" Type Headers Required: Shorty or stock manifolds
    Piping Material: Stainless Steel Piping Size: 2.5"
    Catalytic Converter: "No" - For off-road use only Fitment: 1999-2004 GT, Bullitt, Mach 1 and Cobra Mustangs

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