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Pypes Catted H-Pipe (99-04 GT)

Market Price $442.99 You Save 12% ($52.00)
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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

    CA Residents: Warning: California's Proposition 65

    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?

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    Questions & Answers (16)

    5 Top Rated Questions

    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.

    Helpful (2) Show 1 more answer

    Is this legal in New York Long Island?

    • This h-pipe uses high flow catalytic converters which may not be legal in some states. Especially for states that have adopted California's emission laws. We highly recommend reaching out to a local shop or state ordinances to confirm if the part will be legal in your state.

    Helpful (1)

    My 02 GT has stock headers. To install this, will this require any cutting or welding or will it bolt right up?

    • This Pypes Catted H-Pipe is going to be a direct fit with the factory manifolds and is not going to require any cutting or welding to install.

    Helpful (1)

    Is this legal in California?

    • Unfortunately, since this H-Pipe does not have a CARB EO number, it would not be legal for road use in California. It may be possible to speak local shops and check state ordinance to see that, since this still has cats, would pass a smog test.

    Helpful (1)

    Do you need 02 extenders for this?

    • 2004 Mustangs require the use of 24" O2 sensor plug-in extender wires.

    Helpful (0)
    Post Your Question
    10 More Questions
    Could I use this as an offroad h pipe as well as a catted h pipe? 1 answer
    Is the Pypes catted h pipe legal in Arizona? 1 answer
    are these the same cats that pypes offers seperate from the entire h-pipe assembly? 1 answer
    will i need to get the car tuned for it to run correctly with these H-pipes? 1 answer
    If I understand this correctly, this h-pipe will reduce the 4 stock cats to 2 cats, correct? 1 answer
    will this work on a 2004 mustang cobra, it is difficult to find catted h pipes 1 answer
    will this work on a 2003 3.8l automatic, with bbk headers ? 1 answer
    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? 1 answer
    Will this H- pipe fit on a 1997 4.6L in a 1999 GT? 1 answer
    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. 1 answer

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    Customer Reviews (15) Write a Review

    Overall Rating 4.3

    out of 5 stars

    Installation Time:Full Day

    Installation Cost:$100-$250

    • Loudness / Volume 4.2 4.2
    • Exhaust Note 4.6 4.6
    • Fit & Finish 4.066667 4.1
    • Bang For Your Buck 4.466667 4.5

    • 4/5

      Installation Time: Afternoon

      September 30, 2018

      Pypes catted h pipe

      It’s a great product. Bolts together right up to where your stock h pipe was. You do need to buy a gasket for the passenger side, also 02 extenders. You also have to cut a section of pipe to fit the catalytic converters tho wich was a bummer but overall great product and very loud.


      Year: 2004 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      May 04, 2018

      Catted H SLP LM1

      Fitment was kind of a bummer, but we made it work. Anyways -- if you've any doubt in your mind whether the 4V sounds better with the X or the H - allow me to put your mind at ease: it's the H. I've ran an X for awhile and now the H. The lower tone, definite rumble, and overall sound of the car seems a little more exotic than the X pipe did. One thing I like the most is the lack of back pressure when you're rolling to a stop in 2nd or 3rd gear - it gurgles A LOT and not just a gurgle - but I've had someone roll up next to me in their GT350 and say he's shocked to hear another car that can gurgle to a stop in the same manner. The cats take a few days to really break in - I noticed a volume change after driving it for awhile. Couple with the SLP LM1's, I think it's the perfect blend of volume and power. Plenty of compliments.


      Year: 2004 Submodel: Mach 1

      Helpful (5)

    • 3/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      April 06, 2018

      Does the job but hangs low

      Made the car a little louder then before with just an slp loudmouth 1 catback but the new high flow cats will scrape on everything. My car is stock ride height and I scrape over very small bumps and declines/inclines. The system is well made but it's holding me back from lowering my car at all i can imagine the headaches it will cause hearing it grind the pavement


      Year: 2001 Submodel: GT

      Helpful (2)

    • 1/5

      Installation Time: Afternoon

      September 13, 2017


      I hate the fitment for it they hang down a couple inches off the ground my friends 99 gt exhaust hangs the same as mine and his is lowered an inch and half


      Year: 2004 Submodel: GT

      Helpful (4)

    • 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 (4)

    • 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 (3)

    • 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 (3)

    • 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 (4)

    • 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 (5)

    • 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 (5)

    • 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 (5)

    • 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 (4)

    • 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 (6)

    • 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 (4)

    • 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 (5)

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