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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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  • 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?
    • GT - 99, 00, 01, 02, 03, 04

    Fits GT Only

    People Who Bought This Item Also Bought

    Most Helpful Reviews

    Imports will fear the thunder!

    I installed this bad boy in about an hour... Then started it up... I think the world may have stopped during that initial start, the. Heavens may have sang, and the ocean roared to match the note that ...

    Read More
    Helpful (26)

    Pypes Off-Road H Pipe

    So i replaced my stock exhaust with the Pypes O/R H Pipe with Violator Mufflers and i have never heard another mustang with this sound, it tops all my friends stangs with flowmaster 10 and 40 series and ...

    Read More
    Helpful (6)

    Overall Rating 4.6 out of 5 stars
    Read All 82 Reviews

    Customer Photos (10) Submit Your Photo

    View All 10 Photos

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    35 Questions / 14 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!


    • 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 won't be disappointed. It will definitely be a better match to your flowmaster 10's.


    Show 4 more answers Helpful (4)

    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.


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


    Helpful (1)

    Can you still reuse your O2 sensors on this midpipe?


    • 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.


    Show 4 more answers Helpful (1)

    I have a 2003 GT with flowmaster 44s on it when i bought the car. Im assuming their welded. Everything else is stock, people says It's direct bolt on, would this work with those flowmaster mufflers? Also people say I can't take it to a shop as it is removing the CATS, and they wont touch that, so would I need to do welding? I live SC with no emission laws. Thanks.


    • The Pypes Off-Road H-Pipe will work with Flowmaster 44s. I would recommend contacting a local shop directly to see if they are willing to do the job. However, no welding is required.


    Helpful (0)

    What bolts will I need from the hardware store so I can buy them in advance and any tips on how to not get any leaks ?


    • The Pypes Off-Road H-Pipe does not require any additional bolts. To avoid leaks just ensure your clamps are tight and there are no loose connections.


    Helpful (0)

    i know this is from 99 to 04 years mustangs but will this fit 96 to 98 cobras ? i think mil will need extensions and hanger will need to be re located to fit ?


    • This Pypes Off-Road H-Pipe will not fit 96-98 Cobras. The piping is actually routed a little differently so the 99-04 exhausts would not fit your Cobra. We would recommend the BBK Off-Road H-Pipe, item 386981, which is specifically designed for the Cobras.


    Helpful (0)

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    Customer Reviews (82) Write a Review

    Overall Rating 4.6

    out of 5 stars

    Installation Time:Full Day

    Installation Cost:$100-$250

    • Loudness / Volume 4.644737 4.6
    • Exhaust Note 4.802631 4.8
    • Fit & Finish 4.447369 4.4
    • Bang For Your Buck 4.75 4.8

    • 5/5

      Installation Time: Less than 1 Hour

      April 19, 2013

      Imports will fear the thunder!

      I installed this bad boy in about an hour... Then started it up... I think the world may have stopped during that initial start, the. Heavens may have sang, and the ocean roared to match the note that emanated from the 4.6L ford engine. Zeus came down from his throne, just to shake my hand. What a great price for a great buy, thanks AM!


      Year: 2002 Submodel: GT Florida, USA

      Helpful (26)

    • 5/5

      Installation Time: Afternoon

      March 22, 2013

      Pypes Off-Road H Pipe

      So i replaced my stock exhaust with the Pypes O/R H Pipe with Violator Mufflers and i have never heard another mustang with this sound, it tops all my friends stangs with flowmaster 10 and 40 series and there x pipes. The throaty rumble this exhaust puts out has earned itself a perfect 5 star, although it does have a quiet idle once you step on the gas its no longer quiet i recommend this exhaust to everyone who likes the old muscle car rumble, thanks AM for an amazing investment


      Year: 2002 Submodel: GT Boston, MA, USA

      Helpful (6)

    • 4/5

      Installation Time: Full Day

      March 02, 2013

      Great sound, few snags in the install

      The finished product sounds amazing, nice deep rumble. The difference from the stock pipes to these is night and day. The reason it took me all day to install is because one of the O2 sensor holes on the pipes had not been threaded. It caused a massive headache for me and my friend, had to find a muffle shop that was open and able to fix the problem. Kind of shows badly on quality control for Pypes but still sounds amazing.


      Year: 2004 Submodel: GT Owasso, OK, USA

      Helpful (6)

    • 5/5

      Installation Time: Shop Install

      June 27, 2014

      Get em!!!

      This off road h-pipe has been the best thing to happen to my mustang it's so loud that I'm scared to put a catback on wonder this thing stays sold out it lives up to the hype!!


      Year: 2000 Submodel: GT Houston, TX, USA

      Helpful (4)

    • 4/5

      Installation Time: Afternoon

      August 26, 2017

      Stock 2001 GT w/ Pypes off road h pipe

      I ordered this off-road h pipe a week ago and received it a few days later. I had a local exhaust shop put it on which came out to 79.50, not bad. This H-pipe sounds so much better than the stock h pipe! When you start the car up it is noticeably louder and deeper. I still have the stock mufflers on but will be putting super 44s on soon. It is decently quiet below 2k Rpms but after that it gets pregesssivly louder and sounds amazing. Puts a smile on my face everytime. Pretty loud so you will turn heads no problem! If you still have that stock h pipe, get this and you will be very happy garunteed.


      Year: 2001 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      October 17, 2014

      Pypes off road H

      Everything about this H pipe is great. Getting old H pipe off is worst thing about the install. If I hadn't had to soak my bolts and wait, install would have been an hour. Only drawback I could find is that there are no bolts sent to attach the new H pipe to the mufflers. ?? Quick trip to the hardware store fixed this but you'd think they would be included. Car sounds great, nice rumble. Thanks AM!


      Year: 2000 Submodel: GT Texas

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      August 15, 2017

      Just what i was expected

      I opted for the H-pipe over the X-pipe, and I'm very satisfied with my decision! My stang has opened up! I love the growl at 2200-2500 RPMs. Just the sound I was looking for.


      Year: 2002 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      October 31, 2016

      great sound!

      Great sound and awesome fitment on 03 mustang gt with a cobra swap. Only thing wasnt a fan of were the clamps. There's minor exhaust leaks which aren't all that noticeable but are there. Sound even better with the flowmaster super 10.


      Year: 2003 Submodel: GT

      Helpful (2)

    • 5/5

      July 28, 2016


      This H pipe is hands down amazing. Paired with the Flowmaster American Thunder catback system, there is no better sound. I get compliments everywhere I go on the sound. Don't waste your money on a X pipe, this thing is Bada$$. Thank you American Muscle!


      Year: 2000 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      October 19, 2015

      Pypes H pipe with Borla mufflers

      I had many people tell me to go with Bassani. I started lokking at the Pypes on here and reading the feedback. I had a friend with a lift install them on my 2000 Saleen SC and it took about 30-45 minutes. I was anxious to hear how it was going to sound with the Borla mufflers because I've always been a Flowmaster person. The sound it great! Its not to loud but just right. It is a deep muscle car sound and I couldnt be happier. The install was a walk in the park and as stated above, the car sounds great. I would not hesitate to recommend this product to anyone. If you have a Saleen with the Borla mufflers than forget Bassani and go with the Pypes! Don't forget the mil sensors. I hope this helps!


      Year: 2000 Submodel: Other Jackson, TN

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      July 21, 2014

      Pypes O/R H-pipe

      great product and good price. (I still have stock mufflers) little louder rumble at idle, hit the throttle it sounds amazing, now my car sounds like a muscle car should sound. Noticeable torque gain. Getting the stock h-pipe off was kind of a pain ain't getting the passenger side off with out a swivel and a extension but after that the install was fairly easy. would have had the whole thing done in about 2 to 3 hours but had to run to the parts store and get longer bolts to bolt to the catback exhaust. If your lookin for that classic muscle car rumble this H-pipe is what you want.


      Year: 2000 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      March 22, 2013

      True Muscle Sound

      Awesome product !!!!! I had this installed in less then an hour and it sounds insane combined with my 2000 Saleens Borla exhaust.This is what a Mustang should sound like.Very Happy.AM is the place to buy from.


      Year: 2000 Submodel: Other Warren Michigan

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      December 22, 2012

      pypes off road h pipe

      This sounds amazing, really deep muscle car sound. So easy to install.


      Year: 2000 Submodel: GT Athens, OH 45701, USA

      Helpful (2)

    • 4/5

      Installation Time: Afternoon

      November 08, 2012


      Nice sound. Great fit. Easy to install. I liked it so much I got my buddy to buy the same one. He loves it just as much as I do.


      Year: 2000 Submodel: GT Mi

      Helpful (2)

    • 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 !


      Year: 2002 Submodel: GT

      Helpful (1)

    • 4/5

      July 24, 2016

      Love the sound

      Installation was a breeze. I was able to reuse the factory gasket but as others have said,the original hardware for the rear couplings is too short because of the bell being larger than needed for Catt back piping. I purchased 3/8 by 3,1/2 inch bolts and the rest was history!


      Year: 2003 Submodel: Mach 1

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      May 21, 2016

      Great roar ! Will turn heads

      Bought his h pipe for that Deep roar , and was not disappointed ! However during installation the 2.5 inch bolts that hold the h pipe to the mufflers did not reach so I had to go to lowes and buy 4 new 3 inch ones so they can fit . They worked out great


      Year: 2001 Submodel: Bullitt

      Helpful (1)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      April 25, 2016

      Big Difference

      if you want your Mustang loud this is the way to go. I put on Flow master super 44s and they were pretty quite. I added this off road H pipe and it was night and day Difference.


      Year: 2004 Submodel: GT

      Helpful (1)

    • 4/5

      Installation Time: Afternoon

      May 14, 2015

      great exhaust

      This exhaust is exactly what my ride needed and great price for the product,highly recommend


      Year: 2002 Submodel: GT Westport MA

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      March 22, 2013

      That perfect exhaust note !

      This exhaust is exactly what you want. The x pipe is to raspy and annoying but this h pipe gives you the perfect note. Nice deep rumble with no raspy high end noise. I would recomend this exhasut to anyone looking to free up some extra HP ! I did feel a mid range gain with this mid pipe.


      Year: 2003 Submodel: GT missouri

      Helpful (1)

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