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

2011-2014 Mustang Road and Track Grip Box
Actual product may differ from photo.
  • 2011-2014 Mustang Road and Track Grip Box
  • Standard included HD control arms
  • Optional upgraded XD control arms
  • Optional added Mm5KM-7
  • Optional Mm5RLCA-57 rear lower control arm brackets
  • Optional MMT-4 Bumpsteer gauge

click on thumbnail to zoom


  • Item # RTB-51

Select Option(s):

Upgrade to XD control arms?




Larger Image

Maximum Motorsports Road & Track Box for 2011-2014 Mustangs greatly improves handling, pushing cornering power above the 1.2g level, while retaining ride quality suitable for a daily-driven Mustang. For 2005-2010 Mustangs, see the RTB-50 package.

RTB-50 equipped

This package is for the driving enthusiast who demands:

  • Superior handling for their street-driven Mustang.
  • Ride comfort suitable for daily commuting and long trips.
  • The ability to enjoy open-tracking or autocrossing with only a minor compromise in performance compared to a Mustang purpose-built for track use.

The Maximum Motorsports Engineering Team fine-tuned this Grip Box through extensive testing. We used a Motec data acquisition system to log-test both street and track sessions. This gave us the precise information we needed to choose swaybar and spring rates for the best combination of ride quality and track performance.

Included Standard items


To order

Related Products

  • Excellent cornering ability
  • Capable of delivering continuous cornering forces above 1.2g, as tested with Michelin Pilot Super Sport tires (tread wear rating of 300)
  • Improves appearance by lowering approximately 1.8" to 1.9"
  • Reduces body roll
  • Quickens steering response
  • Reduces brake dive
  • Moderate change in ride quality; from OEM-soft to firm, yet not harsh


  • 2011-2014 Mustang

2005-2010 Mustangs need the RTB-50 Road & Track Box