Name: Magnaflow Off-Road Tru-X X-Pipe (99-04 4.6L)
Brand: Magnaflow
SKU: 48003
Rating: 4.9 (32 reviews)

Product Information

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

Features

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

Description

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.

Fitment:

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

4.9

Customer Reviews (32)

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Ratings Summary

4.9 out of 5 overall rating from 32 customers

Installation Time: Afternoon

Installation Cost: $100-$250

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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.
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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!
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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 better....it 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.
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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.
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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.
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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.
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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!!!
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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.
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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!!!!
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February 27, 2012

5 2000 GT - Dmax Installation Time: Shop Install

A Must Have

immediately felt performance increase and sounds absolutely nasty. highly recommended
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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.
No, only the 2004's need it. It says that specifically in the description.

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

This X Pipe is designed for manual or automatic.
Yes

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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.
Yes, you would need those extensions.

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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.
Around 19 to the rear wheels and 18 ft-lbs torque
You should see a pretty decent ~10rwhp increase. Note, when you install a O/R X you will either need MIL eliminators or a tuner that has the ability to turn off your rear O2 sensors. And since you have an 04, you will need rear O2 sensor extensions.

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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

No, this x pipe will not work with long tube headers. It will fit with shorty headers though. If you want longtubes you will need a matching 'shorty' midpipe.
No. this is a standard length x pipe for shorty headers. As to what shorty headers to go with that is complety up to your taste, preference, and pocket book. If going with " lts" aka long tube headers you need a shorty x pipe. the catback system is the same after you choose your headers and x pipe. also just a fyi if you have an automatic 99-04 gt longtubes wont fit as a direct bolt up it takes some modifications to make them fit. Shortys fit as a direct bolt on. Hope this helps.
Will not work with long tube headers. I used BBK shortie's they give the best fit.

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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

The x pipe is widely known to produce more power on these cars than the h pipe. Just think of the way exhaust flows through both pipes and how much better and continuous the flow would be on the x pipe.
A x pipe will always add more performance then an h pipe. It's better airflow for the system. All an h pipe does basically is this. it allows the air flow to be equal to both sides when talking about the preasure. the x pipe is a much smoother flow, better sound in my oppinion and will yield more h/p.

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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

That's exactly what the MILs are intended to do. Due to removing your cats, the MIL eliminators will turn off the corresponding CEL! I highly recommend a custom tune down the road though as it will help you see the full potential of the mods on your Mustang!
MIL eliminators prevent the check engine light from coming on, yes. MIL stands for 'malfunction indicator light'
Yes it will, mine never came on after the install. Still hasn't either.

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Do i need mil eliminators if i have a bama tune? 2 answers

Nope! The MIL eliminators turn off your CEL caused by installing an off-road mid-pipe. If you have a Bama tune that encompasses this mid-pipe, you wouldn't need to purchase the MILs.
If you have a tuner, you do not need MIL eliminators because the tune gives you an option to turn off the rear O2 sensors.

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Installation & What's in the Box

Installation Info

Installation Time

(approx) 2 Hours

Difficulty Level:

Light to Moderate mechanical skill required.

Installation Guides

No guide available for this part yet. Find out how to get up to $200 for writing an install guide.

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