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Pypes Catted X-pipe (99-04 GT)

13 Reviews
Our Price


  • Item #20039
  • MPN# XFM36

  • Market Price $431.99
  • You Save 9% ($40.00)
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  • Balance out exhaust gases for more power
  • Raspy Race Car Growl
  • Pypes modular construction
  • High-flow catalytic converters included
  • 2.5" 409 stainless steel tubing
  • Fits 1999-2004 GT Mustangs
Balances Exhaust Gases. The Pypes Catted X-Pipe is excellent when it comes to balancing out the gas pressures in your exhaust system. This Pypes x-pipe creates more power and torque than a traditional H-pipe. Why? Because the exiting exhaust pulses are merged at the "X", resulting in less exhaust back pressure for more power.

Race Car Growl. This free flowing Pypes x-pipe for the 1999 to 2004 GT's not only increases power, but it also adds a raspy, race car growl to the sound of your exhaust with its modern "X" 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 factory cats to provide a significant increase in horsepower and torque.

Application. This Pypes Catted X-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 factory manifolds and a dual catback exhaust installed.

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

Mustang Fitment: 1999 2000 2001 2002 2003 2004 Details

What's in the Box
Hardware included:
  • (4) 2.5" band clamps
  • All required fastners (nuts, bolts, washers)
Installation Info
Tech Specs
Mid Pipe Specifications
Style Mid Pipe: Standard length "X" Type Headers Required: Shorty
Piping Material: 409 Stainless Steel Piping Size: 2.5"
Catalytic Converter: "Yes" Fitment: 1999-2004 GT Mustangs
  • GT - 99, 00, 01, 02, 03, 04

Fits GT only

Most Helpful Reviews View All

Overall Rating 4.2/5 Write a Review

Sound=10 Quality of material=8 Fitment = 6 I recenlt purchased the pypes kit and i give it 3 stars because of the fitment . The cutting of the pypes was cake but when the install came nothing was close

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Helpful (8) (0)

not 100%

Was unhappy when i went to line everything up. did not go together very well, everything was off. i have a tiny exhaust leak now because of it. but i guess you get what you pay for if you want a better

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Helpful (3) (0)

Customer Photos (3) View All

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Q & A (3 Questions, 2 Answers) Ask a Question

Is my exhaust compatible/easy to connect? I purchased the Pypes violator catback exhaust system for my car and had the mechanic install them for me. I wanted to know if these X pipes are going to be fine for the exhaust system. Now that i see that both have 2.5 inch tubing, there shouldn't be a problem, and i didn't change my headers, so they should technically fit, right?

Bruce22 Year: 2002 Model: GT

Question Resolved
Good Question (0) (0)
  • If you have a 99-04 GT, this X-pipe will be a direct replacement for your stock mid-pipe! You won't have any problems installing with your stock headers or Violator catback!

    Helpful (0) (0)

    LisaS Year: 1992 Model: GT

Will this work for my exhaust? Will this work for a Cherry Bomb Extreme Dual Exhaust?

Stormer Year: 2004 Model: GT

Be the First to Answer This Question
Good Question (0) (0)

Fit on stock Catback Will this bolt onto my stock catback? I know its 2 1/4 piping but I don't know if it will bolt on properly or be restricted cause of the smaller piping. I only changed the muffler on the car and the rest is stock. Do we also need a tune for this X-Pipe or can we just bolt it on?

RaymondB Year: 2000 Model: GT

Question Resolved
Good Question (0) (0)
  • Yes

    Helpful (0) (0)

    tsmooth Year: 1997 Model: GT

Reviews (13) Write a Review

  • 5 Stars .54 54%
  • 4 Stars .23 23%
  • 3 Stars .15 15%
  • 2 Stars 0 0%
  • 1 Stars .08 8%

out of 5 stars

10 Customers Recommend this Product

Installation Time:Weekend

Installation Cost:$100-$250

  • Loudness / Volume: 5 5/5
  • Exhaust Note: 5 5/5
  • Fit & Finish: 4 4/5
  • Bang For Your Buck: 5 5/5
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  • 3/5 No, I do not recommend this product

    April 25, 2010


    Sound=10 Quality of material=8 Fitment = 6 I recenlt purchased the pypes kit and i give it 3 stars because of the fitment . The cutting of the pypes was cake but when the install came nothing was close to lining up. I used a car lift which was very helpfull. The fitment was off by inches every which way. For a tip, a good ratchet strap can help pull things in place.(thats what i had to use). But other than fitment it was great but my opinion if you have the little extra money i would go with a little better brand.


    Helpful (8) (0)

  • 3/5 No, I do not recommend this product

    September 27, 2010

    not 100%

    Was unhappy when i went to line everything up. did not go together very well, everything was off. i have a tiny exhaust leak now because of it. but i guess you get what you pay for if you want a better pipe then pay the extra cash.


    Driving Style: Daily Driver

    Helpful (3) (0)

  • 1/5 No, I do not recommend this product

    April 09, 2010

    Worest Fit EVER

    I'm attempting to install the Catted X-Pipe in my 2000 GT. This is the worest fitting X-Pipe I have ever seen. The x-pipe to cat flange on the passenger's side is about 2-3" off (pointed towards the front tire). I've wrestled with this for over 4 hours. I finally got the down pipe, cats, and x-pipe connected (barely!). Now the line-up with the Cat-bac exhaust is off. I don't see how this is going to "seal". I'm guessing I'll have exhaust leaks all over the place. I've TRIED to contact Pypes tech-support, complete waste of time. I am totally dissatisfied with this product and their customer service. I will never purchase PYPES again. American Muscle has been great, they've been as helpful as they can be. The problem is not them, it is Pypes.


    Year: 2000 Model: GT

    Helpful (3) (0)

  • 5/5 Yes, I recommend this product

    May 02, 2010

    Vicious Exhaust

    I bought this x-pipe a few weeks ago and eventually gave in and bought Pypes' high-flow cats before getting it installed. Right after the install, I was a bit disappointed with the sound. However, as the days have passed, my exhaust has become gradually louder and louder and the tone has drastically changed. I have this paired with a Magnaflow Magnapacks catback (which sounded great on its own) and together they sound fantastic. Even with the cats, the x-pipe sounds vicious and made a huge difference. I had mine professionally installed and it did not take more than three hours. Recommended!

    Steve Bolger

    Helpful (1) (0)

  • 4/5 Yes, I recommend this product

    May 22, 2009

    Awesome x pipe

    They sound great. Install is not so much fun. Watch those passenger side header bolts! Quiet idle. I wish it was a little louder. but it sounds great when opened up. I have a slight love hate with the high flow cats. Keeps me legal but still a little quiet for my taste. Noticed a power increase too.


    Helpful (1) (0)

  • 5/5 Yes, I recommend this product

    April 26, 2010

    Pypes X-pipe Catted

    I installed this on my 2002 GT, i had already installed slp loudmouths before installing this, i removed the old pipes and converters, unplugged O2 sensors ect... to help everyone out while installing this: the original downpipe will need to be cut 9.5" to incoprate the cats, after this i started by bolting the driverside down pipe, a gasket is not required stock but for a fitment issue i had i bought a donut gasket bacause the pipe didnt fit snug, while bolting the passanger side you may still have the flanged gasket or have to buy a new one, i then clamped the new cats on and then added the X-pipe portion, it was a snug fit but you will get it, i added new studs to the endpipe midpipe flange part to secure it together. the sound from this pipe is great and clean, its wonderfull and i recomend it tho the difficulty of the install, i also did this with my car on jack stands so everyone can do it. Go American Muscle!!!!!!!!


    Year: 2002 Model: GT

    Helpful (1) (1)

  • 4/5 Yes, I recommend this product

    August 21, 2009

    Pypes 409 Stainless Steel Catted X-pipe (99-04 GT)

    very nice sound and excellent quality

    Dale B

    Helpful (0) (1)

  • 5/5 Yes, I recommend this product

    April 28, 2014

    Love the sound and increased performance....

    I was apprehensive about doing this myself. After much deliberation I decided to have the local muffler shop do it for me. I was in the shop roughly 2.5 hours. The actual amount of time they worked on it was 1.5 hours. I'm glad I had them do it, as it had the original exhaust and 107,000 miles on it and I would have had to cut the bolts that connected both ends. Even though it is a 2004 and the instruction said I didn't need the O2 extensions, neither side would reach the back of the cats. After releasing the harness, the passenger side was able to connect. I had to order the extensions to get the drivers side connected. It still has the original Ford mufflers and sounds great!


    Year: 2004 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 1 Oxford Charter Township, MI, USA

    Helpful (0) (0)

  • 5/5 Yes, I recommend this product

    August 11, 2012

    Decent fitting pipe at a great price.

    Fit pretty good on my mustang and doesn't hang excessively low. The cats have their own O2 holes/bungs so it's easy to add a wideband sensor if you'd like.


    Year: 1999 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Central PA

    Helpful (0) (0)

  • 4/5 Yes, I recommend this product

    March 07, 2010

    Pypes x pipe

    This product was very easy to install. I was a little scared on having to cut the pipe to fit the cats but ended up doing good. I loved the price and the HP gain wasnt that bad and also great sound.

    Mr. Pelonee

    Helpful (0) (0)

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