FAQs & Tech Tips


MM News

NASA Racers! MM will support NASA road racers with $1,000 contingency prizes for the American Iron, American Iron Extreme, and Spec Iron at the 2019 National Champions. You must register to be eligible.

New! Read the article Maximum Motorsports Tames Fox & SN95 Mustang Rear Suspensions on FordMuscle.com.

MRT Exhaust! MM now offers premium MRT cat-back exhaust systems for 1996-2004 Mustangs.

New! for Street & Strip Mustangs! Big-bore rear wheel cylinders for 1979-1993 Mustang with 9" drum brakes. Improves braking when running big rear tires and front skinnies, and/or different OEM front brakes.

New! Swapping a Coyote into a Fox Mustang? MM's Hydroboost Conversion Kits allow easy installation of a 1996-2004 Mustang Hydroboost power brake assist unit into a 1979-1993 Mustang.

New! Swapping an IRS into your Fox Mustang? MM makes it easier with a brake line kit made just for this conversion. Bolts-in, with no cutting or flaring of brake lines. Designed to fit standard IRS brake hoses.

New! MM's billet aluminum Pedal Box Spacer for Fox Mustangs. Replace the breakage-prone OEM plastic spacer when converting to manual brakes or Hydroboost.

Canadians! Please read the latest about ordering from Canada/shipping to Canada.

We've posted the parts list and link to the video of MM's Mustang in /DRIVE Tuner car Shootout

MRT Cat-back Exhaust, 1999-2004 Mustang GT, Bullitt, Mach 1
Actual product may differ from photo.


  • Item # 92B20

Select Option(s):

Muffler Series



MRT and MM collaborated in designing this cat-back exhaust to fit with the MM Panhard Bar and Torque-arm!

Of course, it also fits with stock upper control arms. Direct-fit, bolt-in installation is DIY-friendly.

Fits 1999-2004 Mustang GT, Bullitt, and Mach 1 with 4.6L engine.

  • MRT mufflers give your Mustang a muscular sound quality.
  • Low drone!
  • Polished stainless-steel tips enhance your Mustang's appearance.
  • High-quality 409 stainless steel muffler
  • Constructed from corrosion-resistant T304 stainless steel, the best for exhaust systems.
  • All component parts (mufflers, hangers, clamps, bolts) are stainless steel.
  • CNC mandrel tube-bending technology for precise fit
  • Unique proprietary manufacturing and quality control process produces the industry's highest-quality and best-fitting exhaust.
  • Backed by industry-leading Limited Lifetime Warranty.

MRT offers 2 muffler choices: MaxFlow and ChamberFlow.

  • Straight-through, sound-absorbing muffler design produces a deep performance sound. Not as loud as the ChamberFlow muffler.
  • At wide-open throttle, the sound level increases to an aggressive performance tone.
  • Loudness rating: 6 on a scale of 1 to 10, with 1 being stock and 10 being near open-pipes loud.
  • Drone rating: 2 on a scale of 1 to 10, with 1 being stock and 10 being intolerable.
  • Chambered muffler produces a deep, full sound that matches the tough American muscle car sound of yesteryear.
  • Straight-through, chambered muffler design allows maximum exhaust flow for maximum performance. Louder than the MaxFlow muffler.
  • Loudness rating: 8 on a scale of 1 to 10, with 1 being stock and 10 being near open-pipes loud.
  • Drone rating: 2 on a scale of 1 to 10, with 1 being stock and 10 being intolerable.
  • 1999-2004 Mustang GT
  • 2001 Bullitt
  • 2004 Mach 1

Does NOT fit Mustang with V6 engine

We're working on FAQs for this product. If you have a question, please use our Contact Us page to email your question. We'll answer your question by return email, and also consider it for possible addition to this FAQ section.

  • MRT designed this system for simple DIY installation.
  • Installation time is about 1 hour.
  • Installation requires only common hand tools.
  • All necessary hardware included.