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Pypes Off-Road X-Box Mid Pipe (99-04 GT)

AmericanMuscle no longer carries the Pypes Off-Road X-Box Mid Pipe (99-04 GT). Please check out 1999-2004 Mustang Stock Length X-Pipes for an updated selection.
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Features & Details

  • Increases Power
  • Deep, Race Car Growl
  • X-Box Center Chamber Design
  • Full Tig-Welded and Mandrel-Bent
  • 2.5" 409 Stainless Steel Tubing
  • Direct Bolt-On Design
  • For Off-Road, Track Use
  • Fits 1999-2004 GT Mustangs
More Power. Increase the horsepower and torque of your New Edge GT Pony by eliminating the power robbing factory catalytic converters and installing a brand new Pypes Off-Road X-Box. The Pypes Off-Road X-Box is designed to offer increased horsepower and torque, as well as an even deeper sound dimension, when compared to your traditional X-Pipe upgrade.

Deep Race Car Growl. This free flowing Pypes X-Box for the 1999-2004 GT Mustang will not only increase power as a result of its perforated X design within the center chamber, but it also adds a deep, race car growl to the sound of your exhaust.

Durable, Stainless Steel Construction. Pypes utilizes high quality 16 gauge 409 stainless steel mandrel bent 2.5" tubing for increased exhaust flow and features fully Tig-welded reinforcement plates for additional strength.

Required Upgrade. For proper operation and maximum power potential this Mid Pipe will require reprogramming the vehicles computer. AmericanMuscle recommends a Bama custom tune with a Mustang Handheld Tuner to reprogram the vehicles computer (ECU) for proper operation.

Application. This Pypes Off-Road X-Box Mid-Pipe is designed as a direct bolt-on for the 1999-2004 4.6L GT Mustangs, with either aftermarket short tube headers or the stock manifolds and a dual catback exhaust installed.

Note. This X-Box Mid-Pipe is intended for off-road, track use only. Does not include catalytic converters.

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: Cancer and Reproductive Harm -

What's in the Box
  • (1) X-Box
  • (2) Down Pipes
  • (2) Clamps
  • (1) Down Pipe Sleeve
Installation Info
Tech Specs
Mid Pipe Specifications
Style Mid Pipe: Standard Length X-Box Type Headers Required: Shorty Headers 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?

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Customer Reviews (3) Write a Review

Overall Rating 4.3

out of 5 stars

Installation Time:Afternoon

  • Bang For Your Buck 4 4

  • 5/5

    Installation Time: Afternoon

    September 16, 2018

    Great mid pipe!

    The Pypes off-road X-Box Mid Pipe is pretty dang sweet! Materials, fit, finish, sound, and performance gains are all top notch. The sound is exactly what I was looking for on my 02 GT with a Magnaflow cat back. It sounds totally unique, not loud and poppy like an off road H and not raspy like other Xs. Just low and mean. I also like that it’s stainless. Install was very easy. Just be sure to go ahead and get a bolt/nut extractor set for removing the passenger side lower manifold flange nut at your local hardware store. I can never remove that one without rounding it off no matter how much PB blaster I use or how careful I am. Very satisfied with the purchase. Thanks AM!


    Year: 2002 Submodel: GT

    Helpful (4)

  • 4/5

    Installation Time: Afternoon

    March 20, 2016

    A must have

    Mid pipe was packaged perfectly. Very easy to follow instructions. Direct Bolt on at manifolds and to my already installed flowmaster cat back. Much deeper tone now! Great product.


    Year: 2002 Submodel: GT

    Helpful (8)

  • 4/5

    Installation Time: Afternoon

    January 06, 2016

    Great sound

    Just put this X pipe on my 04 v6 that had a magna flow x-pipe before. This is much deeper sounding and makes it rumble more aggressive!


    Year: 2004 Submodel: V6 Gilbert, AZ

    Helpful (7)

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