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Pypes Off-Road H-Pipe (99-04 GT)

Market Price $233.99 You Save 12% ($28.00)
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$205.99

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  • Item 20131
  • MPN# HFM16

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    Features, Video & Details

    • Improves Exhaust Flow for More Power
    • Classic Muscle Car Rumble
    • 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

    Improves Flow For More Power. Add even more horsepower and torque to your 4.6L GT Mustang by eliminating those power robbing factory catalytic converters with a brand new Pypes Off Road H-Pipe. The Pypes off-road H-pipe will significantly improve your Mustang's exhaust flow for a notable increase in horsepower and torque.

    Muscle Car Rumble. This free flowing Pypes h-pipe for the GT Mustang will not only increases power, but it also adds a deep muscle car rumble to the sound of your exhaust with its classic "H" crossover pipe design.

    Modular Construction. Pypes unique three piece modular construction makes it quick and easy to add or remove catalytic converters 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 exhaust flow and features welded reinforcement plates for additional strength.

    Application. This Pypes Off-Road H-pipe is designed to be a direct bolt-on for the 1999 to 2004 4.6L GT Mustangs 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.

    Fitment: 1999 2000 2001 2002 2003 2004 Details

    What's in the Box
    • (1) Two-piece H-pipe
    • (2) Down Pipes
    • (2) Clamps
    Installation Info
    Tech Specs
    Mid Pipe Specifications
    Style Mid Pipe: Standard length "H" Type Headers Required: Shorty or Stock Manifolds
    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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    39 Questions / 48 Answers

    Ask a Question

    How is the sound? I'm thinking of buying this h-pipe but I can't decide. I want a loud exhaust note but I don't want it to be raspy. I think the x-pipe would make my flowmaster 10 series too raspy, would the h-pipe be better? Thanks!

    chevyeater

    • The h-pipes are known to give off a deeper, more classic muscle car sound while x-pipes tend to give off a raspy, more exotic high pitched note. If you want a loud and deep exhaust note, go with the off road h-pipe...you won't be disappointed. It will definitely be a better match to your flowmaster 10's.

      Brian89

    Show 4 more answers Helpful (4)

    I'm curious to if this will in fact fit a 2001 Bullitt? I'm not sure why it says no and can't figure out why this wouldn't when the other Pypes H pipe will. According to the site no midpipe will fit my 01 Bullitt with shorties....

    Weister

    • Yes! This will fit. Your Bullit will still maintain the same 4.6 2v motor and body design as the GT.

      AMBrianT

    Helpful (1)

    Is there any reason why this should not fit a 2003 Mach 1. I was under the impression the mid-pipes for the GTs and Mach1s were the same. Thanks.

    Ryan

    • You are correct! They are the same. You shouldn't have any issues fitting this to a Mach 1

      MachRMan

    Helpful (1)

    Will this fit my 01 bullitt? It says GT only but the bullitt shouldn't have anything to keep this from fitting right?

    TheBullitt

    • Yes! This will fit. Bullit still maintains the same 4.6 2v motor and frame/body design as the GT.

      MachRMan

    Helpful (1)

    My exhaust is stock. Will this bolt right on to my stock exhaust or do i need other modifications? I want to know can i just bolt this h pipe on to my stock exhaust?

    Pilzbrydroboy

    • Yes, direct bolt on to stock exhaust. Just follow the directions. You'll love the sound!

      AlaskaStang

    Show 1 more answer Helpful (1)

    Can you still reuse your O2 sensors on this midpipe?

    warewolf39

    • You should definitely be able to reuse your factory 02 sensors with this midpipe. However, because the cat's are gone you will need to purchase a set of mil eliminators to go in line with the rear O2 sensors in order to avoid the check engine light.

      Luckstone

    Show 4 more answers Helpful (1)

    People Who Bought This Item Also Bought

    Customer Reviews (89) Write a Review

    Overall Rating 4.7

    out of 5 stars

    Installation Time:Full Day

    Installation Cost:$100-$250

    • Loudness / Volume 4.614458 4.6
    • Exhaust Note 4.795181 4.8
    • Fit & Finish 4.46988 4.5
    • Bang For Your Buck 4.73494 4.7



    • 5/5

      Installation Time: Afternoon

      June 09, 2018

      Awesome!!!

      Pypes H-Pipe is a fantastic product. Does not come with a passenger side exhaust manifold gasket, but I was able to reuse mine. Uninstalling from the manifolds was kind of a pain but was able to do it all with hand tools, off floor jacks. Install was much easier than taking off the stock h pipe. Sounds so good! Really wakes up that engine and can feel some power difference. The sound is definitely more muscle car than raspy which is what I was going for. I installed this on a ‘99 Cobra eventhough it says its for a GT it fit perfect!!! Very recommended.

      KenK

      Year: 1999 Submodel: Cobra

      Helpful (0)

    • 5/5

      Installation Time: Full Day

      April 13, 2018

      Awesome

      Hard to take out the old stock H pipe but easy to install the new aftermarket one. And I would recommend it over the stock H pipe because it gives it a deeper tone

      DannyK

      Year: 2001 Submodel: GT

      Helpful (1)

    • 4/5

      Installation Time: Afternoon

      March 05, 2018

      Works!

      Good setup for the price, 4 piece design makes it easier to install. Didn't include longers studs to the axle back portion. maybe my axle back was not stock but I don't think so. The stock studs from my axle-back's where too short. Ended up with some stuff from the hardware store. Not a big deal though, they where rusty anyway. Don't be surprised if it takes you all evening to install without a lift. Getting everything into position is kind of a pain. I used some exhaust gasket maker around each fitting for a real good seal and it's held up well.

      EricK

      Year: 2001 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      February 28, 2018

      Classic Rumble

      By far my favorite modification that I have done to the car so far. The previous owner installed a set of Flowmaster 40 series mufflers, but kept everything else stock. I really love the classic sound of the Flows, but I felt that the exhaust flow was being stifled before the mufflers, and wanted to have more distinction and a better exhaust tone. I used a Bama X4 tuner to turn off the rear O2 sensors, and install took about 4 hours on the cold garage floor. Car is now much louder, but has the classic muscle sound I was looking for. At idle, the lope is amplified, but is not overwhelming. But stab the throttle, and God himself will take notice. I did not experience ant real fitment issues, although my drivers side exhaust tailpipe sticks out a little farther after the install. Not a big deal, only between a 1/4" and 1/2" of difference between the tailpipes. No leaks that I could make out, but this was probably due to the fact that I used an electric impact wrench to tighten everything down. In addition, I would advise against expecting a huge performance increase after installing this product. A mid pipe will generally net you 6-12 hp at the crank. Considering that this is a less than 4 power increase from stock power for a GT, you will likely never notice it.

      Andrew

      Year: 2002 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      February 28, 2018

      Worth The Money

      The product itself is very well made and worth the money. It took me 3 days to install due to dufficulty getting the manifold bolts off but went on easy after that. The kit does not include the extended hardware needed to mount to the cat-back but $5 at the hardware store and she sounds like a real muscle car now :)

      CalebKoki

      Year: 2003 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      February 10, 2018

      Amazing !!!!

      I have the Pypss M-80 and after installing this Off road H pipe from Pypes exhaust as well my car sounds beyond amazing ! Highly recommend !

      JP

      Year: 2003 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      February 08, 2018

      Perfect

      Fits perfectly to the headers, and gives off a really nice exhaust note. Deep, but loud. I have it paired with the SLP loudmouth catback and, oh man, its ridiculously loud now. Great product from pypes

      KyleF

      Year: 2001 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      December 15, 2017

      Pypes !! Awesome sound

      Made my Mustang gt sound like a beast!!! One of the best upgrade I have done , not too loud inside of car, has that old Muscle car sound, love this as much as my 410 gear But back to the pypes I go to alot of shows the old timers tell me how good it sounds

      Mustangshane

      Year: 2002 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      December 04, 2017

      Sounds good now

      Simple to install. Look good and sound great. Cant wait to put some Flowmaster on them

      TXH

      Year: 2004 Submodel: GT

      Helpful (2)

    • 5/5

      November 21, 2017

      Great sound at higher RPM

      This H pipe sounds great on my '02 GT. Not much of an increase in sound at an idle but at the upper ends of the shifts it sounds excellent. I have had many complements from neighbors (at least 5 Mustang owners on the block). I also purchased the MIL eliminators at the same time and they too work as advertised...no check engine lights. I would highly recommend this purchase and especially from American Muscle. I have had outstanding service and support with every purchase I've made. I purchased these pipes (and other items) from A.M. and the shipping is the best I’ve ever experienced.

      CameronG

      Year: 2002 Submodel: GT

      Helpful (2)

    • 4/5

      Installation Time: Afternoon

      November 11, 2017

      Good pipe, installation weird

      The pipe sounds great, but it was kind of a hassle to install. If you have a GT then theres an extra sleeve type thing you have to put on the driver side at the headers. Without it you'll have a pretty big exhaust leak, but even with it im getting an exhaust leak (although this is probably mostly bc im very new to this but that also goes to show its not that intuitive). Going with an offroad pipe is gonna give you a bad smell around the car. This pipe gives a highway drone thats unnoticeable at 55, but at 70 its terrible. The sound really opens up at 2500 rpm.

      JoshL

      Year: 2003 Submodel: GT

      Helpful (2)

    • 4/5

      Installation Time: Afternoon

      November 09, 2017

      pypes h pipe exactly what the doctor ordered

      Here's my experience with the pypes off rd h-pipe. My kit was missing the down pipe sleeve. This took a week to rectify. This despite Pypes checklist in the box for the packer to sign off on each part as it is boxed. I also called Pypes tech support to inquire about using factory bolts, which they assured me I could reuse. This was mentioned by several reviewers.Well useless advice as no way to reuse factory fasteners. I was able to buy some nice 7/16 bolts (3") and that's the way to go. Some reviewers used 3/8 bolts and they are not beefy enough. I got it installed and it did require quite a lot of adjustment to finally stop the leaks. Also the right side down pipe just barely clears the body. If it was any closer I would ask for another. I used Walker 2-1/2" lap joint mega-clamps on the down pipes and a 2-1/4" on the h-pipe as the supplied clamps are cheap and prone to leak. I only use these clamps on exhaust jobs. Do yourself a favor and spring for these, they are simply amazing and strong. The aft end of the H-pipe required some hammering to get them smooth and round. Now for the result.... Awesome!!! I did my research and it payed off. If you like the raspy rattle snotty exhaust note, this is not your item, get yourself an x-pipe. I am using factory mufflers no cats. I see other reviews have said this pipe is everything from obnoxiously loud to same as factory h-pipe with cats. I can't explain that but I find it 10-15 louder with the note very similar to stock at Idle. Nice. When you're on it it is much louder but very nice and no drone at 65mph. It sounds great, ballsy, and is the best price I could find on web. Great tasteful muscle car rumble. Gotta have one.

      TonyK

      Year: 2000 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Less than 1 Hour

      November 09, 2017

      Astoundingly Great!

      Great pipes! Well made! This will definitely make your current exhaust 3 times louder!

      OmarM

      Year: 2002 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      October 22, 2017

      Great install

      Sounds amazing and can feel the difference over the stock h pipe. Fit mostly well. Don't forget the downpipe gasket!

      DavidC

      Year: 2004 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      October 10, 2017

      Awesome sound!

      Fast delivery and pipes sound perfect, easy install.

      ToddL

      Year: 2003 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      September 29, 2017

      GREAT SOUND!

      I've wanted these for years but was afraid they'd be too loud. Well, I was wrong! They are loud but only when you want them to be and I haven't stopped smiling since I put them on! I also have the super 44s and its a great sound! If you bought a Mustang because you like that sound, you will be kicking yourself you did not buy these sooner!

      Dono

      Year: 2003 Submodel: GT

      Helpful (1)

    • 4/5

      Installation Time: Afternoon

      September 19, 2017

      Great Kit

      Fits ok, looks good, Sounds awesom, I was happy I went with the H instead of the X. Only wish it included the required bolts to clamp to existing exhaust, and a new gasket for the passenger side. But overall great product !

      DerrickA

      Year: 2002 Submodel: GT

      Helpful (5)

    • 3/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      September 17, 2017

      Works

      Customer service from AM is great as usual. As far as the midpipe...leaks a little in various places. Either weld this up or spend a little more for something better. Ended up pairing this with American Thunder catback. Sound is epic! Performance gains...meh... gas pedal feels a little lighter but, no big power difference.

      KyleS

      Year: 2001 Submodel: GT

      Helpful (2)

    • 4/5

      Installation Time: Afternoon

      September 06, 2017

      Great H pipe

      Took about 2.5 hours to install. Ran into one issue with the passenger side pipe was hitting the floor pan. Had to be bent a bit to fit right. Other than that, things went smooth and gave my stang a great sound paired with the Violater cat back.

      Brett

      Year: 2003 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      September 02, 2017

      Amazing sound.

      I love it. My stang sounds more loud just like I wanted it to be.

      Bob

      Year: 2001 Submodel: GT

      Helpful (2)

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