Free Shipping On Orders Over $49. Details

Talk to a Mustang Expert
1-877-887-1105
Every day 8:30AM EST - 11:00PM EST
Win 1 of 3 Exhaust Kits! Enter Daily!

Pypes Off-Road X-pipe (99-04 GT)

Market Price $226.99 You Save 12% ($27.00)
Starting At

$199.99

FREE Shipping

  • Item 20004
  • MPN# XFM16

Local Install Shops

Quoted installation from $125

View 3 Shops

near 19355 (change)

Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.

Will this fit your Vehicle?

In Stock Ships same business day.
Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

    Features, Video & Details

    • Balance Out Exhaust Gases for More Power
    • Raspy Race Car Growl
    • Pypes Modular Construction
    • For Off-Road Track Use
    • 2.5" 409 Stainless Steel Tubing
    • Fits 1999-2004 GT Mustangs

    Review & Installation Video

    Review & Install Video

    Hey everyone, I’m Justin with AmericanMuscle.com and this is our power pack bolt on build up series, for all 99-04 Mustang GTs. With this power pack, we’ve put together some products that we feel are great first time mods, that would give any 99-04 GT a serious boost in power. So we’re going to get a quick baseline run, then hand our GT over to the crew so they can get started installing our power pack. Hey what’s going on Mike? Mike: Hey man, nothing, just finished the installation of our mods and we’re about to make another Dyno run. Justin: Very nice, yeah it looks good under here, what you got installed under the hood? Mike: Well first we installed Airaid cold air intake kit that comes with a high flow reusable air filter, so you never have to replace it. The Airaid’s going to increase air flow for the engine and allow it to breathe better and make more horsepower and it’s also going to help on fuel efficiency. Justin: Yeah, if you can stay off the pedal, right? Mike: Yeah. Justin: I see we’ve also got the BBK installed, what’s up with that? Mike: This is the one piece throttle intake, that features the throttle body and the plenum, that way you can have a bigger throttle body and not worry about restricting the air flow with a factory plenum. Justin: Mike, I know with this generation and these mods, we shouldn’t really need a tune right? Mike: Right, we don’t require a tune, but we are going to install a Bama performance custom tune, just to kind of tie everything together. Especially on our automatic, it’s going to help with our shift firmness, our shift points, and overall. Justin: That’s awesome, I know in conjunction with these mods we also have the Pypes off road X pipe going on, along with that Flowmaster American Thunder series Cat-Back as well, what kind of numbers are you expecting from all these mods? Mike: We should expect to see about 20-25 horsepower. Justin: Sounds good to me man, you ready to do another run? Mike: Absolutely, let’s do it. Justin: So our baseline run on our automatic 2000 GT gave us 222 horsepower and 260 ft/lbs of torque, with our powerpack installed, we made 249 horsepower, and 295 ft/lbs of torque, giving us a peak gain of 27 horsepower over our baseline numbers and gains of 35 horsepower and 54 ft/lbs of torque throughout the curve. So as you can see we’ve just finished off our second Dyno run and we’re definitely happy with the results, the best part is all these mods are installed easily in just a few hours using basic hand tools. Now let’s get our GT off the Dynojet and onto the streets, so we can hear that Flowmaster in action, and see what these mods did for our motor. Alright, now we’ve got our GT out of the shop and onto the streets and been able to put it through its paces a little bit, it’s easy to see why these bolt ons are such a popular first choice with so many Mustang owners out there, especially these 99-04’s. Those bolt ons really woke up our 2 valve motor, especially when paired with our Bama tune, which has really firmed up our shifts as well. So be sure to check out some of our other 99-04 bolt on build ups where we improve our handling, work on our acceleration, and dress up our GT a little bit.

    Balances Exhaust Gases. Pypes Off Road X-Pipe is second to none when it comes to balancing out the gas pressures in your exhaust system. This Pypes off road x-pipe creates more power and torque than a traditional H-pipe. Why? Because the exiting exhaust pulses are merged at the "X", resulting in less exhaust back pressure for more power.

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

    Modular Construction.   Pypes unique three piece modular construction makes it quick and easy to add or remove a catalytic converter to your exhaust system in just minutes depending on your driving needs.

    Durable Stainless Steel Construction.   Pypes uses sturdy 16 gauge 409 stainless steel mandrel bent 2.5" tubing for improved flow and features welded reinforcement plates for additional strength.

    Application. This Pypes Off-Road X-pipe is designed to be a direct bolt-on for the 1999 to 2004 4.6L V8 GT Mustangs with either aftermarket short tube headers or the factory manifolds installed. Intended for off-road, track use only, does not include catalytic converters.

    Technical Note: 2004 model year Mustangs will require the use of 18" O2 sensor plug-in extender wires!

    Fitment: 1999 2000 2001 2002 2003 2004 Details

    CA Residents: Warning: California's Proposition 65

    What's in the Box
    Hardware included:
    • (2) 2.5" clamps
    Installation Info
    Tech Specs
    Mid Pipe Specifications
    Style Mid Pipe: Standard length "X" Type Headers Required: Shorty
    Piping Material: 409 Stainless Steel Piping Size: 2.5"
    Catalytic Converter: "No" - For off-road use only Fitment: 1999-2004 GT Mustangs
    Will it fit my Mustang?

    You Might Also Like

    Customer Photos (12) Submit Your Photo

    View All 12 Photos

    Questions & Answers (25)

    5 Top Rated Questions

    Will my check engine light stay on if i use this X-pipe? If I was to use this pipe will It keep my check engine light on or will it stay off? And if it does stay on is there anything I can get to get it to go off?

    • Using this Off-Road X-pipe will cause your CEL to turn on due to removing your catalytic converters. You have two options to turn off the CEL, both of which I've attached below for you. You can purchase the MIL Eliminators, which sole purpose is to turn off the CEL caused by off-road mid-pipes. The other option is to get a custom tune for your Mustang. It will turn off the check engine light as well as improve the overall performance of this mid-pipe upgrade. It automatically enrolls you in our Free Tunes for Life Program so you can receive updated tunes when you do any future mods as well! Feel free to contact us with any further questions!

    Helpful (8)

    will this fit the slp loudmouth cat back exhaust?

    • The Pypes Off-Road X-pipe will fit with any aftermarket or stock catback, and will attach on the other end to stock exhaust manifolds, or to any aftermarket shorty header.

    Helpful (2)

    Will this x pipe fit around a auto trans?

    • These Pypes Off-Road X-pipe will fit both automatic and manual transmission applications.

    Helpful (1)

    I know this says "offroad use only," but let's be honest, people who use this on their daily, how loud is it? Can you even get by on the road or is it a total cop magnet?

    • Off Road, Mid Pipe is intended for off-roaduse only due to their emissions. The mid pipe will be loud which can draw attention to your Mustang.  

    Helpful (0)

    Will this bolt up to the v6s BBK 1-5/8 in. Chrome Shorty Headers here on the site

    • Unfortunately, this is designed to work with the GT Mustangs and will not work with the V6 model Mustangs.

    Helpful (0)
    Post Your Question
    10 More Questions
    I ordered this X pipe along with an SLP exhaust kit , and wondering later on I wanted to install long tube headers , will I able to do that or I would have to change my set up 1 answer
    i currently have mac pro dump 2.5 inch exhaust after my stock midpipe. will this fitt with dumps? 1 answer
    will this with with mac pro dumped exhaust? 1 answer
    Why won’t these fit on a bullitt? 1 answer
    Will this bolt right up to my borla catback ? Have an 03 5 speed 1 answer
    If i bought this then bought cats after how much do i need to cut to make it fit 1 answer
    Will i need o2 extenders for this x pipe 1 answer
    I have an '04 V6. Will this fit my stock headers or will I have to purchase the V6 version of this x-pipe? 1 answer
    Does does this kit come with gaskets to the stock heads or will I need any at all? And if so how do i purchase some? 1 answer
    will this bolt right on without having to add tubing , because i didnt want to buy the cat , just the x pipe 1 answer

    People Who Bought This Item Also Bought

    Customer Reviews (100+) Write a Review

    Overall Rating 4.3

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:0-$100

    • Loudness / Volume 4.671429 4.7
    • Exhaust Note 4.785714 4.8
    • Fit & Finish 4.471428 4.5
    • Bang For Your Buck 4.714286 4.7



    • 5/5

      Installation Time: Less than 1 Hour

      August 31, 2018

      x pipes

      Fast shipping and in great shape!! thank you very much!

      Claire

      Year: 2004 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      August 15, 2018

      Great sound with stock mufflers!

      Wasn't sure how it would sound with stock mufflers but has a great sound! Install would have been quicker if it wasn't for not having went ahead and purchased the optional hardware for mid-pipe to cat-back(mine was seized to old mid pipe). Also instructions say to get 3/8-16x2 1/2 bolts and hardware but when I got home from purchasing these they were short by at least half an inch and small for both holes so I went ahead and got 7/16 by 3" and they were a lot better. Looking at Pypes Pype bomb cat back in the near future but for now I'm very impressed by the sound that these have when paired with stock mufflers.

      AaronS

      Year: 2004 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      August 13, 2018

      Bang for the buck

      My car had an xpipe on it that someone had put "converters" on.. and it droned so bad inside the car. This pypes xpipe is awesome.. super simple install and fit great. And the best part.. no more drone inside the car. Took less than an hour to install in my shop on a lift while replacing the entire exhaust.

      DanB

      Year: 1999 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      August 08, 2018

      Sounds amazing!!!

      Easy to install took about 2 hours after fighting with passenger side manifold for about an hour. Other then that it fit perfect

      BrianC

      Year: 2000 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      August 04, 2018

      X pipe

      Great product. Made sound much louder. Loved it. Very easy installation. Very quick shipping. Overall great product suggest anyone get it if they are looking for meaner sound n a growl

      JS

      Year: 2004 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      July 28, 2018

      Great Product

      Woke the sound of the car up between 25-3000 RPMS, and gave it a nice, raspy tone. Not a ton louder at idle, but when you get on it, it really shines.

      JacobG

      Year: 2003 Submodel: GT

      Helpful (1)

    • 4/5

      Installation Time: Less than 1 Hour

      July 21, 2018

      Great product

      Pretty simple install and fit was good but I also used stock cat back

      RicardoC

      Year: 2000 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      July 17, 2018

      Great!

      It went on easy and and a huge improvement on sound and etc. no problems just that the end of the X-pipe did not really fit flush with my mufflers. But other then that great!

      JoeyG

      Year: 2003 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Full Day

      July 07, 2018

      Pypes

      It was great easy fit sounds awesome I recommend this product

      TravisS

      Year: 2001 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      June 23, 2018

      X pipe

      Amazing tone, easy install, decent improvement on throttle responsiveness. Nice and loud

      ColeS

      Year: 2001 Submodel: GT

      Helpful (1)

    • 4/5

      Installation Time: Afternoon

      June 18, 2018

      Amazing sound

      This x pipe is great and sounds very aggressive. The only thing i am dissapointed in is the fitment was a little off, you will need some longer bolts to connect the midpipe and a passenger header gasket. Other than that not too bad for the price.

      GriffinL

      Year: 2001 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      June 05, 2018

      great fit and finish

      would have taken less time to swap if my hands weren't to big to get the o2 censers plugged back in. over all good product

      TimothyN

      Year: 2003 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      May 25, 2018

      Sounds awesome

      Really wakes up the sounds of the 4.6 L. Super easy to install comes with all parts you need beside passenger side gasket. Loved this product highly recommend. Took a couple hours to install just make sure you have a swivel socket for the passenger side header. Also pick up a gasket on the website for passenger header.

      WhitneyC

      Year: 2003 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      May 16, 2018

      Sounds mean !!

      Bought SLP loudmouths 1 for my 04 Mustang GT. Was happy with the exhaust but i was looking for a meaner kind of growl and this gave it to me ! Sounds great.

      Stephen

      Year: 2004 Submodel: GT

      Helpful (2)

    • 4/5

      Installation Time: Afternoon

      April 26, 2018

      Great sound

      Was a pain putting in on the passenger side but worked out. Paired up with a SR performance cat back and has a great growl to it. Breathes much better.

      MichaelR

      Year: 2003 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      April 07, 2018

      Wakes up the mustang!

      Very happy with the sound! Relatively easy to install assuming your previous midpipe isn’t rusted on. I run this with my SLP Loudmouth.

      WillH

      Year: 2002 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      March 15, 2018

      Pypes O/R X Pipe

      The installation was easy, it sounds amazing paired with a Borla ATAK. Very, very loud. The hard part was getting off the old stuff that has sat there for almost 20 years (‘99). Just be prepared to get frustrated, use as much PB blaster as humanly possible. Extra stuff you’ll (maybe) need is longer bolts for the connection of the mid pipe to the cat back, new gasket for passenger side. Possibly new studs for the manifold connection. Also when installing, don’t tighten all the bolts right away like I did, make sure you have all the connections and then tighten it.

      Matt

      Year: 1999 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      March 07, 2018

      Off road x

      Best bang for the buck and fit perfect no issues sounds amazing along with there Borla stinger set up deff recommend the plug eliminator so you will have no check engine light when done fit perfect had no problem

      MatthewJ

      Year: 2003 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Afternoon

      February 28, 2018

      Absolutely amazing!

      Top passenger side manifold nut was a little tricky to work with but it was so worth it! Completely changed the tone of my Stang from a quiet street car to an angry beast! People will definitely turn heads when they hear this thing!

      MichaelC

      Year: 2000 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Less than 1 Hour

      February 22, 2018

      Pypes Off Road X is Great! Obnoxious!

      This thing makes my 02 GT loud like crazy! This is the best mod that you could do to ANY GT Mustang! Whoever says this pipe doesn’t fit, obviously doesn’t know how to install an exhaust. Pypes X pipe fits perfectly with stock headers and a Cat back. With barley any Knowledge, I put this on along with my friend. This was extremely easy to put on. Took about an hour. The results are worth it. The American Thunder catback with this works perfectly! Thank you AM for such an amazing product!

      Tyler

      Year: 2002 Submodel: GT

      Helpful (2)

    Related Mustang Categories