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Pypes Catted H-Pipe (99-04 GT)

Market Price $429.99 You Save 12% ($50.00)
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  • Item 20132
  • MPN#CVM10K

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Features & Details

  • Improves Exhaust Flow for More Power
  • Classic Muscle Car Rumble
  • Pypes Modular Construction
  • High-Flow Catalytic Converters Included
  • 2.5" 409 Stainless Steel Tubing
  • Fits 1999-2004 GT Mustangs
Improves Flow For More Power. Improve the horsepower and torque of your 4.6L GT Mustang by replacing those restrictive stock cats with a brand new Pypes H-Pipe that features high-flow catalytic converters. The Pypes high flow catted 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. The included High flow catalytic converters far out perform the restrictive stock cats to provide a significant increase in horsepower and torque.

Application. This Pypes Catted H-pipe is designed as 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.Technical note: 2004 Mustangs require the use of 24" O2 sensor plug-in extender wires.

Fitment: 1999 2000 2001 2002 2003 2004 Details

What's in the Box
  • (1) Two-piece H-pipe
  • (2) Down Pipes
  • (2) Catalytic Converters
  • Clamps
Installation Info
Tech Specs
Mid Pipe Specifications
Style Mid Pipe: Standard length "H" Type Headers Required: Shorty or Stock Mainfolds
Piping Material: 409 Stainless Steel Piping Size: 2.5"
Catalytic Converter: Yes Fitment: 1999-2004 GT Mustangs
Will it fit my Mustang?
  • GT - 99, 00, 01, 02, 03, 04

Fits GT Only

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Most Helpful Reviews

Excellent quality

I used this H-pipe on my 1996 gt, fit great with a little trimming of down-pipes. I'm sure it fits better for the mustang it is made for, heh (the 99-04 gt). It is a very modular h-pipe. You can substitute ...

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Helpful (1)

Great product

Gave me just the sound I was looking for. Matched with flowmaster original 40 mufflers gives the classic muscle car sound.

Helpful (1)

Overall Rating 4.7 out of 5 stars
Read All 11 Reviews

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6 Questions / 8 Answers

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The new Catted H-pipe. With my 2003 mustang gt all ready being lowerd 2 inch in the front and 1 quater in the rear, will the new Catted H-pipe sracth the ground or hit the ground with people in the car?


  • I lowered my 2004 2" in the front and 1-3/4" in the back and installed catted X pipes and cat-back exhaust. The aftermarket exhaust parts were not any lower than the factory exhaust and I have plenty of clearance. The key during installation is to jack up the connection between the H or X pipes and the cat-back before you tighten everything up to make sure the exhaust is up as tight as it should be to the chassis. I had no trouble with this.


Show 1 more answer Helpful (2)

will this work on a 2003 3.8l automatic, with bbk headers ?


  • This has specific fitment for the 4.6L GT models from 1999-2004 only.


Helpful (0)

i plan on eventually getting long tubes for my 04 GT. Would i be able to use this system and then remove the cats and down pipes from it once I get my long tubes or would I need to buy a whole new midpipe?


  • You will most likely have to do some modifications to this H-Pipe to make it work with long tube headers. This is because part of the down pipe is going straight forward, not all of it is moving up toward the engine. If you were to take the down pipes and the cats off, the H-Pipe would not reach the headers. You will need to buy the Pypes Off-Road H-pipe (96-04 GT w/ Long Tube Headers), item # 20024, (http://www.americanmuscle.com/pypes-hpipe-shorty-offroad-9604.html). This H-Pipe will bolt right up to long tube headers without having to do any modifications.


Helpful (0)

Will this H- pipe fit on a 1997 4.6L in a 1999 GT?


  • The Pypes Catted H-Pipe (99-04 GT) will only work on a 1999 to 2004 body Mustang. If you have a 1999 Mustang with a 1997 motor in it, you will not have any problems.


Helpful (0)

Will this fit on a Mach 1? Most makers list mid pipes that fit GT/Mach 1/ Bullit. This one says GT only. Will it fit my Mach 1? The only other catted H pipe I've found is MRT, and it is $600. I'd like to use this mid pipe, and the Pypes Violator or Magnaflow catback for old-school muscle car sound.


  • Yep! This will fit the Mach 1s. I have this installed on my 2004 Mach 1, along with Borla Stingers. It sounds great.


Helpful (0)

h pipe vs x pipe What are the pros and cons of the h and x pipes? Which one would I get more gains from?


  • Based upon my experience, typically you'll see a better sound from an H and a better performance gain from an X. If your going from a stock H to this one, you'll see very low-moderate gains, especially because its catted.


Show 1 more answer Helpful (0)

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Customer Reviews (11) Write a Review

Overall Rating 4.7

out of 5 stars

Installation Time:Full Day

Installation Cost:$100-$250

  • Loudness / Volume 4.090909 4.1
  • Exhaust Note 4.727273 4.7
  • Fit & Finish 4.545455 4.5
  • Bang For Your Buck 4.727273 4.7

  • 5/5

    Installation Time: Afternoon

    March 18, 2017

    Excellent quality

    I used this H-pipe on my 1996 gt, fit great with a little trimming of down-pipes. I'm sure it fits better for the mustang it is made for, heh (the 99-04 gt). It is a very modular h-pipe. You can substitute your own straight pipes for off road use ( I think Pypes sells the exact length ones), Swapping out cats is easy as they are not welded in, same goes for replacing the passenger side manifold gasket, easier job with this H-pipe. Shiney


    Year: 1996 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    November 02, 2016

    Great product

    Gave me just the sound I was looking for. Matched with flowmaster original 40 mufflers gives the classic muscle car sound.


    Year: 2001 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    April 19, 2013

    Quality product

    I watched this H pipe being installed and it went right together with no problems. When on the road, the noise level is very similar to stock. However, when I get on it, the exhaust takes on an aggressive tone and loudness level. This is just what I was looking to have. The cats supplied are throwing no codes. I highly recommend this H pipe. Thanks AM.


    Year: 2001 Submodel: GT Lincolnton, NC 28092, USA

    Helpful (2)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    April 06, 2016

    decently good

    It's a decent product at most. I haven't seen much of a difference in acceleration. I do agree it sounds similar to stock at idle or at least until you put your foot on it and it sounds great It finally starting to kick in. I should probably get a tune for it...


    Year: 2000 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    January 16, 2015

    It is what it is.

    It's a decent mid-pipe. The cel light will trip with these, I recommend getting a tuner because the mils didn't work for me and the mid-pipe takes a bit of fabbing up to do, I took it to an exhaust shop and had them do it all. I recommend getting them welded since the cats and mid-pipe dont have a tight coupling when you're installing them. Extenders aren't necessary if you're doing the mil route.


    Year: 2002 Submodel: GT Fort Bragg, NC, USA

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    November 13, 2014

    Sounds great!

    Hello AM, Overall, I am very pleased with this H-pipe. Installation isn't difficult, the one thing to keep in mind is that the manifold downpipes need to be cut to integrate the cats. I recommend buying more substantial band clamps to secure the cats to the downpipes, to better prevent leaks. I wouldn't mind if the pipe tucked a bit higher to the body of the car, but it doesn't hang excessively low. It sounds awesome matched up with Borla Stingers out the back! I prefer the deeper, throatier rumble of H-pipes. Everyone thinks my Mach sounds great. Regards, Matt


    Year: 2004 Submodel: Mach 1 New York

    Helpful (1)

  • 4/5

    Installation Time: Afternoon

    August 22, 2014

    good product for the price

    The pipe took about 3.5 hours to install at the local exhaust shop. It's definitely got a better sound than the stock pipe. And looks much better. I do feel like it hangs a bit lower than stock though


    Year: 2003 Submodel: GT maryland

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    August 02, 2013

    great item

    i added this along with the Flowmaster American Thunder Catback, sound is amazing. deep tone with aggression! would definitely recommend getting a mid pipe when doing the cat back.


    Year: 2001 Submodel: GT Aston, PA

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    July 15, 2017

    Big difference...!!

    I love the sound, the installation was a breeze, I'll recommend 100 and now you can tell that it turn heads around, if you are thinking about it don't think no more go for it, H-Pypes with a Flow master 40 series does the trick for me....!!!


    Year: 1999 Submodel: GT

    Helpful (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    July 01, 2017

    Good parts, good price

    Pypes makes a fine product for a good price. I'd recommend them to anyone looking for either or.


    Year: 2002 Submodel: GT

    Helpful (0)

  • 4/5

    Installation Time: Full Day

    April 14, 2017


    Took some reconfrigering to install with out the extension wiring but very happy with the performance and the deep throaty sound. Also improved gas mileage by 4 miles.


    Year: 2004 Submodel: GT

    Helpful (0)

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