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

Market Price $226.99 You Save 12% ($27.00)
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$199.99

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  • Item 20004
  • MPN# XFM16

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    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

    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?

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    24 Questions / 4 Answers

    Ask a Question

    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?

    boze35

    • 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!

      LisaS

    Helpful (7)

    will this fit the slp loudmouth cat back exhaust?

    HectorD

    • 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.

      Rob D

    Helpful (1)

    Will this x pipe fit around a auto trans?

    RobertO

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

      AMJEFF

    Helpful (1)

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

    BrandonM

    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

    MohamedM

    • The Pypes Off-Road X-pipe would only be compatible with factory headers, If you were to upgrade to long tube headers you would need a short x-pipe for proper fitment. Feel free to give our customer service department a call if you have any additional questions regarding your planned setup!

      AMMikeS

    Helpful (0)

    i currently have mac pro dump 2.5 inch exhaust after my stock midpipe. will this fitt with dumps?

    TheodoreM

    People Who Bought This Item Also Bought

    Customer Reviews (100+) Write a Review

    Overall Rating 4.2

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:0-$100

    • Loudness / Volume 4.719298 4.7
    • Exhaust Note 4.77193 4.8
    • Fit & Finish 4.473684 4.5
    • Bang For Your Buck 4.68421 4.7



    • 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 (1)

    • 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 (1)

    • 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 (2)

    • 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 (1)

    • 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 (2)

    • 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 (1)

    • 5/5

      Installation Time: Less than 1 Hour

      December 22, 2017

      Pyres off road x-pipe

      Super easy to install fits perfect sounds awesome!!!

      DaveR

      Year: 2001 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      December 03, 2017

      Awesome

      Took a while to get the old stuff off a 175xxx mile car but after I got it on with my flowmeter super 10s car sounded mint

      bluebeuaty

      Year: 2004 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      November 27, 2017

      X pypes

      Great product, easy install and nice sound. Quality is good. I don't see any flaws in the welds.

      JeffC

      Year: 2001 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      November 03, 2017

      Awesome

      Sound is amazing! was pretty easy to install and doesnt take to long to inatall !

      MinkelC

      Year: 2002 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      October 31, 2017

      X pipe by Pypes

      This Cat less X pipe added to my completely stock 04 mustang GT is awesome. Even with stock mufflers my car sounds awesome. Always get compliments on the sound. Mine is a 04 so I did have to get the 02 wire extenders along with the MIL eliminates. But it all worked out great!!!

      NickS

      Year: 2004 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      September 13, 2017

      X Pipe FTW

      Gonna be honest , I was a little hesitant when I read all the reviews on this product , but the price was good so I still went for it , overall it fit very well , there was an opening that was misshaped it was an oval instead of a circle but that was easily fixed , very aggressive sound , paired with SLP LoudMouth 1's . I'm so happy I went with pypes , great product and great noise !!

      RodolfoG

      Year: 1999 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      September 04, 2017

      Sounds Great.

      The pypes sounds really great, very happy with the product.

      ScottC

      Year: 2001 Submodel: GT

      Helpful (2)

    • 3/5

      Installation Time: Afternoon

      August 08, 2017

      Pretty good product

      Out of the box it looks really nice, a little dissapointed that i only recieved one of the two collectors that you're supposed to get, amd the passenger side downpipe was drilled incorrectly and did not at all fit. I wasn't a huge deal just drilled it out correctly. Just expectes it to come correct

      ShaneH

      Year: 2002 Submodel: V6

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      July 28, 2017

      Sounds great!

      The x pipe sounds great. 2-3k rpms has a nice deep raspy sound

      MattA

      Year: 2000 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      July 15, 2017

      O/r x pipes

      I love it makes my 4.6 roar!! Would recommend to anyone looking for more throaty growl.

      TyriqueL

      Year: 2000 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      June 17, 2017

      Pypes are perfect!!

      Exactly the sound I was looking for love the fit love the sound and the performance.

      TravisD

      Year: 2003 Submodel: GT

      Helpful (1)

    • 4/5

      Installation Time: Less than 1 Hour

      June 12, 2017

      Awesome sound.

      This bought out an extra bit of growl. Sounds great paired with the Borla cat-back. Minor fitment issues but nothing that couldn't be overcome. Good bang for buck.

      PrestonS

      Year: 2003 Submodel: GT

      Helpful (2)

    • 4/5

      Installation Time: Afternoon

      June 08, 2017

      Loud

      I paired this with the SLP loudmouth cat-back and its loud! Sounds great for a 4.6. Only down side is the top right side of the X pipe is rubbing on frame. But with a little bend and some Header tape it should fix it.

      RoyS

      Year: 2001 Submodel: GT

      Helpful (2)

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