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MAC Off-Road X-Pipe (99-04 4.6L w/ Long Tube Headers)

Market Price $206.95 You Save 13% ($27.00)
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  • Item 40066
  • MPN# X994

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Features & Details

  • Improves Exhaust Flow for More Power
  • Raspy Race Car Growl
  • For Use with MAC Long Tube Headers
  • Intended for Off-Road, Track Use
  • 2.5" Mandrel-Bent Aluminized Steel Tubing
  • Fits 1999-2004 GT, Bullitt, Mach 1 and Cobra Mustangs
Improves Flow For More Power. Add even more horsepower and torque to your 4.6L Mustang by eliminating those power robbing factory catalytic converters with a brand new MAC Off Road Shorty X-Pipe. This off-road shorty X-Pipe when combined with a pair of MAC Long Tube Headers will greatly improve your Mustangs exhaust flow for an increase in horsepower, torque, and throttle response.

Race Car Growl. This free flowing Mac Performance Mid Pipe will not only increase horsepower and torque, but it also adds a crisp raspy, race car growl to the sound of your exhaust with its modern "X" 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 X-Pipe is designed for use on 1999-2004 GT, Bullitt, Mach 1 and Cobra Mustangs with MAC Performance Long Tube Headers installed. Intended for off-road, track use only, does not include catalytic converters. Technical Note. This MAC Performance product is intended for off road use and is not legal for use in emission restrictive states.

Fitment: 1999 2000 2001 2002 2003 2004 Details

What's in the Box
  • (1) Mid-pipe
Installation Info
Tech Specs
Mid Pipe Specifications
Style Mid Pipe: Shorty "X" 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 GT & Cobra Mustangs
Will it fit my Mustang?
  • Bullitt - 01
  • Mach 1 - 03, 04
  • Cobra - 03, 04, 99, 01
  • GT - 99, 00, 01, 02, 03, 04

People Who Bought This Item Also Bought

Most Helpful Reviews

Terrible fitment

Does not line up at all with the headers, it's about an inch too narrow. I'll have to modify it or heat it up and bend it so it can fit. And still have to worry about it leaking. For $180, I would've expected ...

Read More
Helpful (3)


Great fit, sounds mean with my Mac long tubes and Borla exhaust. Would recommend 100%

Helpful (2)

Overall Rating 4 out of 5 stars
Read All 15 Reviews

Customer Photos (5) Submit Your Photo

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4 Questions / 4 Answers

Ask a Question

I have a 99 v6 but I would like to have a gt catback, will this x-pipe fit with the ceramic long tube headers you have for the 99-00 v6? And which catback setups will fit as well?


  • The MAC Off-Road X-Pipe is designed specifically for the 4.6L With longtubes, and would not work with your V6 with longtubes. You would need the MAC Off-Road H-Pipe linked below, which will work with GT catbacks on your V6

    Rob D

Helpful (0)

Will this trigger a service engine light for my O2's after I install it since the cats are gone? If so, what do I do to fix that? Thanks in advance!!! Mike


  • When installing a off-road mid pipe like the MAC Off-Road X-Pipe (99-04 4.6L w/ Long Tube Headers) you will have a check engine light. to fix this would to either get a Bama custom tuner or the MIL eliminators. Links to each will be below.


Helpful (0)

would they fit with a pype longtube headers?


  • This shorty mid-pipe is intended to be used with the MAC Long Tubes. As a general rule of thumb when installing Long Tube Headers, the same brand shorty mid-pipe should be used to ensure proper fitment. That being said, you should be able to install this shorty o/r x-pipe with the Pypes Long Tubes. Just be mindful that it may not be a direct bolt-on and some minor adjustments may be needed for a proper install. Hope this helps.


Helpful (0)

would this work with pypes long tube?


  • Using the MAC Off-Road X-Pipe (99-04 4.6L w/ Long Tube Headers) with any long tube header that is not MAC will very likely result in modifications in order to make it work.


Helpful (0)

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Customer Reviews (15) Write a Review

Overall Rating 4.0

out of 5 stars

Installation Time:Full Day

Installation Cost:$250-$500

  • Bang For Your Buck 3 3

  • 1/5

    Installation Time: Afternoon

    February 19, 2017

    Terrible fitment

    Does not line up at all with the headers, it's about an inch too narrow. I'll have to modify it or heat it up and bend it so it can fit. And still have to worry about it leaking. For $180, I would've expected a better quality piece.


    Year: 2004 Submodel: GT

    Helpful (3)

  • 1/5

    Installation Time: Weekend

    January 02, 2017

    Mac x pipe

    Looks good but only has a small aprox 1 inch hole where the exhaust will cross i cut it open and made the hole bigger i also have mac headers and it was norrow had to heat it and bend to fit


    Year: 2004 Submodel: Mach 1

    Helpful (2)

  • 5/5

    March 22, 2013


    Great fit, sounds mean with my Mac long tubes and Borla exhaust. Would recommend 100%


    Year: 1999 Submodel: GT Toronto, ON, Canada

    Helpful (2)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    April 13, 2017


    This x pipe fit great with my mac longtubes and sound great with my slp cat back a nice deep rumble


    Year: 2004 Submodel: GT

    Helpful (1)

  • 5/5

    August 16, 2016

    Great product

    Love the Mac longtube x pipe combo really woke my car up.


    Year: 2004 Submodel: GT

    Helpful (1)

  • 5/5

    November 09, 2015

    Sounds sweet!

    Have this pipe mated up the the Mac long tube headers; works great and sounds mean! Most go prochamber, but I wanted something a little different. Fit is good finish is meh.. Don't hack up your existing mid pipe, buy this bad boy and sell your old one!


    Year: 2001 Atlanta

    Helpful (1)

  • 4/5

    July 04, 2015

    Sounds great, small fitment issue

    Put this midpipe behind new MAC longtubes, only issue was fitment. On front end of pipe that bolts to headers it had to be spread slightly to line up with the headers. Otherwise sealed up tight with no leaks soo far, sounds amazing flowing into Borla S (stingers)


    Year: 2002 Submodel: GT Iowa

    Helpful (1)

  • 5/5

    May 29, 2015

    Great product

    Fitment is perfect with my Mac long tubes, sound great, just switched from h pipe to x pipe and I'm loving it


    Year: 2004 Submodel: GT Perry, GA

    Helpful (1)

  • 5/5

    February 17, 2015

    Mac daddy!

    Just done installing the mac x pipe and long tube headers. Sounds awesome! Nice bump in power and a killer cackle. Everyone should have these parts on their pony.


    Year: 2003 Submodel: GT Avon, IN

    Helpful (1)

  • 4/5

    January 30, 2014

    Good product could be a better fit

    I had installed these on my 04 mustang gt with a set of mac long tube headers. The fitment of the x pipe was about a quarter of an inch off so i had to bend and tweak this x pipe to work. Overall wasn't bad took about 30 minutes to install. The sound is amazing a nice smoother idle with a little bit of tone and a nice roar when you open it up. Ts a good item and definitely recommend to anyone thinking of a a long tube set up.


    Year: 2004 Submodel: GT Wilmington, NC, USA

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    November 09, 2017

    Mac off road xpipe for longtubes

    Perfect fitment with manzo longtube headers sound is agressive adds a nice raspy crackle to exhaust note


    Year: 2002 Submodel: GT

    Helpful (0)

  • 4/5

    Installation Time: Shop Install

    September 30, 2017

    Great top end power

    Car pulls much better up top with the o/r x coupled with the LTs


    Year: 2000 Submodel: GT

    Helpful (0)

  • 1/5

    Installation Time: Less than 1 Hour

    May 29, 2017


    Bought this x pipe to go with the Mac long tubes and it's not even close to matching up with the headers. It fits on one side, but the other side it is too far out. I expect to get some sort of partial refund since now I have to use my money to modify an x pipe that should have just bolted on.


    Year: 2003 Submodel: GT

    Helpful (0)

  • 5/5

    May 12, 2017

    Mac off road x pipe

    I love it going to order my Mac Chrome long tube headers as well


    Year: 2003 Submodel: GT

    Helpful (0)

  • 5/5

    July 24, 2013

    Great fitment quality and sound

    This Mac offroad shorty X pipe is a very good quality midpipe, it sounds amazing and fits perfectly up to the Mac longtube headers with no leaks, and it looks very nice too, if your going with longtubes like I did, the Mac offroad shorty X pipe is the way to go! And not only that American Muscle has the best customer service I've ever had and I have been buying from them for years , you can't go wrong with this X pipe or American Muscle. Thanks American muscle! Ill be ordering again soon!


    Year: 2003 Submodel: Mach 1 Easley, SC, USA

    Helpful (0)

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