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MAC Aluminized Off-Road Pro Chamber Mid Pipe (99-04 GT, Cobra w/ Long Tube Headers)

AmericanMuscle no longer carries the MAC Aluminized Off-Road Pro Chamber Mid Pipe (99-04 GT, Cobra w/ Long Tube Headers). Please check out 1999-2004 Mustang H-Pipes for an updated selection.

Features & Details

  • Improves Exhaust Flow for More Power
  • Unique Pro Chamber Crossover Design
  • For Off-Road, Track Use
  • 2.5 inch Mandrel-Bent Aluminized Steel Tubing
  • Fits 1999-2004 GT & Cobra Mustangs w/ MAC Long Tube Headers
Increase Exhaust Flow. Get rid of those power robbing factory catalytic converters and uncork your Mustangs hidden power with a MAC Performance Shorty Off-road Mid-Pipe. Featuring the exclusive Pro Chamber style crossover and free-flowing mandrel-bent tubing, this high performance shorty Mid Pipe in combination with MAC Performance Long Tube Headers will dramatically improve exhaust flow for more horsepower and torque.

Aggressive Muscle Car Rumble. This free flowing shorty MAC off-road Mid Pipe not only increases the horsepower and torque of your Mustang, but with its unique Pro Chamber cross over design it adds a more aggressive muscle car rumble to the sound of your exhaust, that the standard H-Pipe just can't match.

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 Pro Chamber Off-road Shorty Mid-pipe is designed for use on 1999-2004 GT & Cobra Mustangs with MAC Performance long tube headers installed. Intended for off-road, track use only, does not include catalytic converters.

This MAC Performance product is intended for off road use, and is not legal for use in emission restrictive states.

Fitment: Details

MPN# PC4900

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

What's in the Box
  • (1) Mid-pipe
Installation Info
Tech Specs
Mid Pipe Specifications
Style Mid Pipe: Shorty 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?

    Customer Photos (8) Submit Your Photo

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      Questions & Answers (4)

      4 Top Rated Questions

      Will this mid-pipe fit with the stock headers?

      • This mid-pipe is designed to work with long tube headers only.

      Helpful (0)

      I have an '04 Mach 1 with BBK long tubes (15330). Will this fit?

      • The MAC Off-road Pro Chamber Mid Pipe (99-04 GT, Cobra w/ Long Tube Headers) will not bolt up with the BBK Ceramic Long Tube Headers (99-04 Cobra, Mach 1). When buying long tube headers you will want to match the same brand header as mid-pipe. We would recommend getting the BBK Off-Road X-Pipe (96-04 4.6L w/ Long Tube Headers) http://www.americanmuscle.com/bbk-offroad-shorty-xpipe-9604v8.html

      Helpful (0)

      Do the MIL Eliminators fit this? This product doesn't have a drop down menu to add the MIL Eliminators. So I wasn't sure if they would fit?

      • Yes they do but a tuner would be a better choice

      Helpful (0)

      Will this fit a 2001 Cobra with MAC Longtubes? Other sites that sell this pipe way it will fit 99-04 GT, Cobra, and Mach 1's that have Mac Longtube headers... so will it fit my 01 Cobra? Does AM only say it fits the 99-04 GT's only because that's the only car they carry MAC LT headers for? I want to buy this pipe from AM, but not if It won't fit my new headers.... thanks!

      • It sure will fit a 2001 Cobra with MAC LT headers. I have a 99 Cobra and this part fit with LT headers. The MAC website says the same. AM, please update your fitment!

      Helpful (0) Show 1 more answer
      Post Your Question

        Customer Reviews (18) Write a Review

        Overall Rating 4.8

        out of 5 stars

        Installation Time:Afternoon

        Installation Cost:0-$100

        • Loudness / Volume 4.117647 4.1
        • Exhaust Note 4.823529 4.8
        • Fit & Finish 4.470588 4.5
        • Bang For Your Buck 4.470588 4.5



        • 5/5

          Installation Time: Afternoon

          February 25, 2019

          Mac headers mac off road pro chamber mid pipe

          Mac has different tune then the stock h pipe better sound that turn heads

          mustangman

          Year: 2003 Submodel: GT

          Helpful (1)

        • 5/5

          Installation Time: Shop Install

          Installation Cost: 0-$100

          February 25, 2018

          Awesome!

          The MAC Pro Chamber gives your Mustang a signature sound that you will not find in a standard H or X pipe. Paired with LT's and a nice exhaust, its muscle car music!

          Jason

          Year: 2004 Submodel: Cobra

          Helpful (5)

        • 5/5

          Installation Time: Less than 1 Hour

          July 17, 2017

          Mac Pro Chamber Mid H-Pipes

          Great product! Replaced Mac X Mid Pipes with this mid pipe because it was too loud. Now the roar is toned down to a nice growl. Wife will now ride in my GT Converible without sticking fingers in her ears. Lol. Lost a bit of power but engine runs smoothly without extreme rear end break out when shifting up and burning rubbers. Recommend this mid pipe.

          ReubenP

          Year: 2003 Submodel: GT

          Helpful (5)

        • 4/5

          Installation Time: Less than 1 Hour

          March 09, 2017

          Sounfs good

          I have mac long tubes with borla stingers. I replaced the O/R H pipe with this and am very happy. It's a little more quite now but so much smoother. Not like a straight pipe Z-71 Like it used to be with the h pipe. The price is a bit high and it's heavy. Fit and finish wasn't that great. But I'm still happy. It's the best of both worlds. Nice deep tone but good performance with out all the rasp.

          SloMo2v

          Year: 2003 Submodel: GT

          Helpful (5)

        • 5/5

          Installation Time: Afternoon

          January 12, 2017

          Great Product!

          I purchased the Pro Chamber for a 2004 Mach 1. I'm running BBK long tube headers so minor fabrication was needed, but it fits nicely and sounds great. You can't go wrong with American Muscle.

          MillerTime

          Year: 2004 Submodel: Mach 1

          Helpful (6)

        • 5/5

          August 23, 2016

          This vs X-pipe...

          My perspective between the two because both were on the car. Ran the xpipe on my Mach for about 1500 miles. While loud and obnoxiously cool, at times there was too much rasp for me. Idle revs gave me goose bumps. Hard acceleration, it screamed. The rasp during normal acceleration got to me though unfortunately. The pro chamber toned it down more than I was expecting but still plenty loud when going, taking away the hard rasp. Wish there were a more definitive video between the two to make a better initial decision. Flowmaster backing Mac longtubes and pro chamber.

          Mach2491

          Year: 2016 Submodel: Mach 1

          Helpful (7)

        • 4/5

          Installation Time: Afternoon

          April 12, 2016

          Mac Pro chamber

          Got this thing bolted in and it sounds amazing! I love Mac exhaust!

          Kris

          Year: 2003 Submodel: Mach 1

          Helpful (6)

        • 5/5

          Installation Time: Less than 1 Hour

          May 29, 2015

          good sound (mac headers only)

          Gives a great sound. No rasp. (Must use with Mac headers only!!) I have bbk LT and nowhere does it say wont it fit other brands. I learned the hard way. I had to fab the prochamber to fit. Worth it you wont be like every other mustang on the road.

          gtford86

          Year: 2004 Submodel: GT Elgin, IL

          Helpful (6)

        • 5/5

          Installation Time: Shop Install

          Installation Cost: 0-$100

          July 05, 2014

          Love the NOTE

          I wanted a little more muscle sound and after a lot of youtube video's I decided this was the one. After the install I was more than amazed with the note. Not bad with the stock flowmaster but I am thinking of borla atak.

          Stan99Cobra

          Year: 1999 Submodel: Cobra Norfolk, VA, USA

          Helpful (6)

        • 5/5

          Installation Time: Shop Install

          Installation Cost: 0-$100

          January 13, 2014

          Loudness depends on your mufflers

          Installed these on my 02 GT vert. when I had the MAC LTs installed. The car is louder than stock, but with the Flowmasters (I think they're either Delta flow 40s or 50s) the car growls a little bit, but not as loud as I want. Next order, I'm getting the Super 40 cat back, that should wake her up!

          JonMc

          Year: 2002 Submodel: GT Tampa, FL, USA

          Helpful (5)

        • 5/5

          Installation Time: Less than 1 Hour

          October 18, 2013

          Best sounding mid-pipe

          Didn't want X-pipe because it's to raspy and didn't want H-pipe and not gain any power. This is just PERFECT, great sounding and decently loud but the note is amazing and very unique. Must buy, only took 30 minutes to install.

          Bullitt3175

          Year: 2001 Submodel: Bullitt Dallas, TX, USA

          Helpful (6)

        • 5/5

          Installation Time: Less than 1 Hour

          May 23, 2013

          Sounds great!

          Swapped my catted mid pipe with this prochamber mid pipe and when combined with my catback and longtube headers the sound was amazing.

          JoeR990

          Year: 2001 Submodel: V6 King of Prussia, PA, USA

          Helpful (8)

        • 4/5

          Installation Time: Less than 1 Hour

          April 26, 2013

          Nice Tone

          Great Product, Install was very easy for a DIY mechanic. Bought these with a set of MAC Long Tube Headers and loving the Sound. Not very Loud to but you can hear the rumble.

          Jermaine21

          Year: 2000 Submodel: GT Baton Rouge, LA, USA

          Helpful (5)

        • 4/5

          Installation Time: Less than 1 Hour

          March 22, 2013

          Mac prochamber

          Good product, sounds good, not as loud as i wanted but definately a better tone than the louder rasp off the off road x pipe, very happy with it

          PL78

          Year: 2004 Submodel: Cobra New york ny

          Helpful (6)

        • 5/5

          Installation Time: Less than 1 Hour

          November 05, 2012

          Awesome mid pipe

          This pipe is amazing if you want to turn heads but not be to annoying eigher, I have Mac long tube headers, Mac Pro chamber mid pipe and flower master super 40s "American thunder cat back system" on my 2000 GT

          Dustycrazman

          Year: 2000 Submodel: GT MO

          Helpful (6)

        • 5/5

          Installation Time: Less than 1 Hour

          July 27, 2012

          Great Product!

          had this installed right after i installed the MAC longtube headers and the exhaust tone its just perfect combined with a flowmaster exhaust. Performance is excellent! recomend this product all day

          CQ808

          Year: 2002 Submodel: GT

          Helpful (6)

        • 5/5

          Installation Time: Less than 1 Hour

          July 27, 2012

          Great mid pipe

          Fit was perfect installed cats into mine sounds and looks great Will def buy again thanks American muscle

          Gem92

          Year: 1999 Submodel: GT Toronto, ON, Canada

          Helpful (6)

        • 5/5

          Installation Time: Afternoon

          June 10, 2012

          Smooth and Soft Idle, yet aggresive acceleration.

          Recently I swapped my car from it's stock 3.8 to a 2000 GT motor. Motor is stock but cars suspension and exhaust is complete. That being said I cannot attest for the difference between stock sound of a 4.6 GT and what my car sounds like, but I don't care because it sounds great. Matched this prochamber with the MAC longtubes and a flowmaster catback and wow great sound. The car is quiet below 2500 rpm and at idle but above that and watch out. Now I've had an off road h pipe and it was very loud especially in the mid range, but this pipe is not as loud yet the torque is always there in any gear. It is not that loud and is a little bit more pricy, however I love the sound of the MAC products so I guess you can say I'm biased. I will post my video below if AM accepts. Again this motor is stock except for K&N and above exhaust. Would def recommend, but if you want a little louder off road x or h may be your ticket, but I still think this one is great and has an amazing sound.

          RUNVSOFTHISBULL

          Year: 2002 Submodel: GT Florida.

          Helpful (6)

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