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MAC Off-Road H-Pipe (99-04 V6 w/ Long Tube Headers)

AmericanMuscle no longer carries the MAC Off-Road H-Pipe (99-04 V6 w/ Long Tube Headers). Please check out 1999-2004 Mustang H-Pipes for an updated selection.

Features & Details

  • Improves Exhaust Flow for More Power
  • Classic Muscle Car Rumble
  • 2.5" Mandrel-Bent Aluminized Steel Tubing
  • Intended for Off-Road, Track Use
  • For Use with MAC Long Tube Headers
  • Fits 1999-2004 V6 Mustangs
Improves Flow For More Power. Add even more horsepower and torque to your V6 Pony by eliminating those power robbing factory catalytic converters with a brand new MAC Off Road Shorty H-Pipe. This off-road shorty H-pipe when combined with a pair of MAC Long Tube Headers will greatly improve your Mustang's exhaust flow for an increase in horsepower, torque and throttle response.

Muscle Car Rumble. This free flowing Mac Performance Mid-Pipe will not only increase horsepower and torque, but it will also add a deep muscle car rumble to the sound of your exhaust with its classic "H" crossover pipe design.

High Quality Construction. Mandrel bent from durable 2.5" steel tubing so there are no kinks to rob you of power, this MAC Performance Mid-Pipe has been hot-dip coated with aluminum-silicon alloy to aluminize the steel to protect against corrosion and rust.

Application. This MAC Performance Off-road Shorty H-pipe is designed for use on the 1999 to 2004 V6 Mustangs with MAC Long Tube Headers installed in combination with an aftermarket or stock dual 1999-2004 GT catback exhaust system.

Technical Note. This MAC Performance product is intended for off road use and is not legal for use in emission restrictive states.

Fitment: Details

MPN# TF3820

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (1) Mid-pipe
Installation Info
Tech Specs
Mid Pipe Specifications
Style Mid Pipe: Shorty "H" Type Headers Required: MAC Long Tube
Piping Material: Aluminized Steel Piping Size: 2.5"
Catalytic Converter: No - For off-road use only Fitment: 1999-2004 V6 Mustangs
Will it fit my Mustang?

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      Questions & Answers (13)

      5 Top Rated Questions

      Does this work with the Mac duel catback tips?

      • The MAC Off-Road H-Pipe will work with the Mac Dual Catback System however, this H-Pipe will require a pair of long tube headers to properly fit with that application.

      Helpful (0)

      Can you weld Cats onto this? So it would be legal in CA? Also, If you have the MAC Duel exhaust conversion kit. The Y pipe, can that exhaust be used with this? If you just remove the Y pipe?, (And get headers obviously)

      • The MAC Off-Road H-Pipe would not be legal in California no. With custom fabrications perhaps this would be but we would advise reaching out directly to a local exhaust shop in your area in terms of the work required.

      Helpful (0)

      Will this work with a 1999 Roush Mustang side exhaust?

      • We have not tested the MAC Off-Road H-Pipe with the Roush Side Exhaust, however we do not foresee any issues.

      Helpful (0)

      Is this Californi Legal?

      • The MAC Off-Road H-Pipe would not be legal in California no.

      Helpful (0)

      Does This H-Pipe Come With The long tube headers like it says in the description or you have to buy it separately ?

      • The MAC Off-Road H-Pipe is designed for the 99-04 V6 Mustangs that have long tube headers installed. You will need to purchase the MAC 1-5/8 in. Ceramic Long Tube Headers, item # 40061, ( separately.

      Helpful (0)
      Post Your Question
      8 More Questions
      Will this H-pipe work with Pacesetter long tube headers for a 2002 V-6 or do I absolutely have to use the MAC headers? 1 answer
      Will this fit a 03 mustang GT? 1 answer
      Will this fit my 1997? 1 answer
      Can I Use The Stock Headers With This H Pipe? 1 answer
      Will this fit any long tube headers or is this proprietary to Mac long tube headers. 1 answer
      I have an 03 v6 mustang with The mac dual exhaust Y pipe. Will long tubes and this H pipe bolt on directly to the mufflers or do i have to get flow tubes? 1 answer
      Are there any exhaust systems that bolt up to this H-pipe or do I need a custom set up to get from the H-pipe to the back of the car? 1 answer
      can I use this to convert so I can hook it up with a flowmaster thunder gt exhaust Is it possible ? 1 answer

        Customer Reviews (11) Write a Review

        Overall Rating 4.8

        out of 5 stars

        Installation Time:Afternoon

        Installation Cost:$500-$1000

        • Loudness / Volume 4.625 4.6
        • Exhaust Note 4.75 4.8
        • Fit & Finish 4.75 4.8
        • Bang For Your Buck 4.5 4.5

        • 4/5

          March 07, 2019




          Year: 2004 Submodel: V6

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          March 13, 2018

          Great all around

          Cant complain about this one bit. Fit great, worth the price, easy to install. What more can you ask for?


          Year: 1999 Submodel: V6

          Helpful (6)

        • 5/5

          Installation Time: Less than 1 Hour

          October 31, 2016

          Sounds deep

          I had the X pipe with the long tubes it sounded like a Damm honda was really upset I got this H pipe with some 3.73 gears the sound is really deep man I love it and I also got a pro charger termis leave me like 1 whole car away


          Year: 2002 Submodel: V6

          Helpful (8)

        • 5/5

          August 22, 2016

          Awesome sound!!

          Went from barely audible, to a rumble that can't help but turn the heads, love it!!!


          Year: 2000 Submodel: V6

          Helpful (8)

        • 5/5

          Installation Time: Afternoon

          July 02, 2016

          Great stuff

          Really changed the sound of my car up glad I got this with the Mac long tube headers


          Year: 2000 Submodel: Other

          Helpful (8)

        • 5/5

          Installation Time: Shop Install

          Installation Cost: $500-$1000

          April 18, 2016

          Absolutely amazing sound

          I went with a H-pipe due to the fact that its reported to have a deeper tone than an x-pipe, and on a v6, that is very important. Came well packaged and the shop said it fit great. To stay street legal, I had high flow cats welded into it and it still sounds and works great. Paired this with the long tubes and a SLP loudmouth catback, and I could not be happier! Would recommend to anyone and everyone.


          Year: 2002 Submodel: V6

          Helpful (9)

        • 5/5

          Installation Time: Less than 1 Hour

          August 21, 2015

          H-pipe makes a world of difference

          I've already purchased the catted pipes x-pipe foe stock exhaust manifolds and frankly left me wanting more with the raspy tone and less than perfect installation instructions. However I was in luck when I found the Mac longtubes for close to nothing and hence bought the H-pipe to give my sixxer a great muscle car tone and a bit more performance to boot. If you haven't thought of going to longtubes I would suggest that you do it as soon as possible cause the H-pipe really makes the exhaust wake up.


          Year: 2002 Submodel: V6 Denton, Texas

          Helpful (8)

        • 4/5

          Installation Time: Afternoon

          May 25, 2015

          Pretty good product!

          Good over all prodect. I did however have trouble fitting one of the flanges to the driver side longtube header. The whole for the stud to pass thrue was offset by a quarter inch or so. So I had to drill the whole bigger. After that went on without any trouble.


          Year: 1999 Submodel: V6 Santa Rosa Ca

          Helpful (8)

        • 5/5

          Installation Time: Shop Install

          Installation Cost: $500-$1000

          May 18, 2015

          Get the long tube headers

          It was about 600 to install the mac longtube headers and h pipe and also i got the slp loudmouth exhust and wow. Its not even the same car now and it sounds so mean!


          Year: 2002 Submodel: V6 Fond du lac, Wisconsin

          Helpful (8)

        • 5/5

          March 24, 2013

          Couldn't Be Happier

          I got the Mac H-pipe because it was required for the Mac long tube headers. I am very pleased with how well this bolted up once I had the headers on. I did not have to re-adjust the exhaust towards the rear of the car at all. This was literally a perfect fit in my case. This actually hangs higher than my other H-pipe i had before which I am very happy about. Once I got this on with my long tubes, I was VERY satisfied with the way it sounded.Has a very mean growl to it... If you want to remove your cats, this is the way to go! Thanks AM!


          Year: 2004 Submodel: V6 Iowa

          Helpful (6)

        • 5/5

          January 04, 2013

          Great partner for MAC long tubes

          I already said most of the story in the MAC Long tubes review, but it's good to see AM offering these as well. Obviously, this being an off road kit means you're losing the cats, which means 1) It's no longer emissions legal 2) It's going to be much louder. Unless you have a highly talented shop man who can make their own mid pipe that will fit the MAC long tubes, you'll have to have the off road H pipe to go with it. Again a note about the oxygen sensors: in some cases you'll need to have 2 sets of extenders instead of just 1.


          Year: 2001 Submodel: V6 Fairfield, IL

          Helpful (7)

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