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Steeda Rear Chassis X-Brace (05-14 Coupe)

AmericanMuscle no longer carries the Steeda Rear Chassis X-Brace (05-14 Coupe). Please check out 2010-2014 Mustang K-Members, Subframe Connectors, & Braces for an updated selection.

Features, Video & Details

  • Ideal for Race Applications
  • Strengthens Chassis to Reduce Flex
  • Retains Rear Seats
  • Black Powedercoat Finish
  • Simple Bolt-In Installation
  • Fits All 2005-2014 Mustang Coupes

Review & Installation Video

Review & Install Video

Reduce Body Flex. A Steeda Rear Chassis X-Brace is a great and easy way to increase the chassis rigidity of your S197 Mustang to eliminate power robbing body flex and to improve handling performance.

Retains Rear Seats. Unlike other rear x-braces on the market today the Steeda Chassis X-Brace does not require removal of the rear seats for installation allowing you to still seat four passengers.

Quality Construction. Manufactured from 4130 chromoly steel for superior strength, this Steeda X-brace is completed in a black powder coated finish for impressive looks.

Bolt-in Design. The Steeda Rear Chassis X-Brace bolts into location using existing factory mounting points with no cutting or modifications required for a straight forward installation. Can be welded into place if desired for additional strength.

Application. This Steeda Rear Chassis X-Brace is designed to fit 2005 to 2014 Mustang Coupes, including the V6, GT, Bullitt, BOSS and Shelby GT500 models. Does not fit convertibles or vehicles equipped with Shaker/Mach 1000 stereo systems.

Note: Coupon codes cannot be applied to this product.

Fitment: 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 Details

MPN# 555-5093

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (1) X-Brace
  • Hardware
  • Instructions
Installation Info
Tech Specs
Will it fit my Mustang?
  • Boss 302 - 12, 13
  • Bullitt - 08, 09
  • GT - 05, 06, 07, 08, 09, 10, 11, 12, 13, 14
  • GT500 - 07, 08, 09, 10, 11, 12, 13, 14
  • V6 - 05, 06, 07, 08, 09, 10, 11, 12, 13, 14

Does not fit convertibles or vehicles with Shaker/Mach 1000 stereo systems.

    Customer Photos (20) Submit Your Photo

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      Questions & Answers (9)

      5 Top Rated Questions

      will rear shock tower brace work with this? could this be used in addition to the steeda rear shock tower brace?

      • Not without modification of the products - bad move to willingly void product liability....Besides, There isn't a need for the addition or use of the shock tower brace when using the Chassis X-Brace. However they both work well - one better than the other. The Steeda Chassis X-Brace attaches to the shocks and shares impact with the rear pan; and the x-y moments of deflection at the top of shock, to include impact are absorbed by the cross chassis bulkhead panel (top attachment) quite well. In the end you have a choice - pick one.... stiff , stiffer with design tolerance of shock bushing movement intact. X-Brace is definitely more ridged.

      Helpful (10)

      I have Koni adjustable shocks. Will this brace interfere with the adjusting knob?

      • This brace should run no interference with the adjustable knobs on the shocks.

      Helpful (2)

      It says it won't fit vehicles that have the Shaker/Mach 1000 stereo systems...Is that for all Shaker systems ?

      • The Steeda Rear Chassis X-Brace will not fit the Shaker 1000 stereo system because of the subwoofers. It will fit the Shaker 500 system.

      Helpful (1)

      Will this work with a shaker pro amp system, or can it be made to work with modifications?

      • It is not compatible with your Shaker system.

      Helpful (0)

      Any benefit of running this with either the Steeda or SR Performance shock tower brace, or will the xbrace perform just as well on its own?

      • The Steeda Rear Chassis X-Brace will act as a beefier rear shock tower brace. This can be used with a shock tower brace, however that is not needed.

      Helpful (0)
      Post Your Question
      4 More Questions
      Will it work for a convertible ?, I know it won’t work with a shaker 1000. Question two? But I still will ask will it work for a convertible with a shaker system. 1 answer
      Will it work for a convertible 1 answer
      Which would be give a stiffer suspension this X-Brace, or a rear strut tower brace in combination with a Seat removal* X-Brace 1 answer
      will amps mounted to back of rear seats interfere with this? I have an AMP mounted on the back of each rear seat, am i correct to assume there will be an issue with installing this product? 1 answer

        Customer Reviews (28) Write a Review

        Overall Rating 4.8

        out of 5 stars

        • 5/5

          March 13, 2019

          Too easy

          Took my son and I about 30 min to install. I bolted it up for now but I do plan on welding it in later. This with the subframe connectors make a huge difference in the corners.


          Year: 2014 Submodel: GT

          Helpful (0)

        • 5/5

          March 07, 2019

          Corner Carver mission

          Haven't installed it yet but it is well crafted, welded and sturdy.


          Year: 2008 Submodel: GT

          Helpful (1)

        • 5/5

          November 14, 2018


          You can really feel how solid it is in the back with this X-Brace! The only thing that gave me a tough time was removing the bolts on the struts, I would recommend letting the soak with a little bit of WD40 first but besides that it was pretty easy. It took me about an hour to install with some help of a friend.


          Year: 2014 Submodel: GT

          Helpful (1)

        • 5/5

          July 18, 2018

          X-Brace works

          Nice product and does "feel" that it does the job. No track times to prove the brace improves the handling, but by the "feel" of the car under hard back-road driving the car does hook up better. Under hard acceleration you just sense the body has less twist and hooks up solid. Those upper bolts when attaching the brace to the frame are tough to get too! Had to use the "tape the nut to the wrench" method to reach the bolt --- if you drop the nut never going to reach it.


          Year: 2018 Submodel: GT

          Helpful (3)

        • 5/5

          June 24, 2018

          #96 R/R

          This product did what was stated and installed with no problem looks great


          Year: 2006 Submodel: GT

          Helpful (3)

        • 5/5

          April 04, 2018

          Makes a Difference

          You can tell the difference in steering response and how the car handles through rough corners. Makes the car feel much more refined and solid. This is an expensive brace, wish someone made a cheaper option but the level of improvement makes it worth paying the price.


          Year: 2014 Submodel: V6

          Helpful (3)

        • 5/5

          March 22, 2018

          Perfect Fit

          Added great stability in the turns and reduced body flex noticeably. Highly recommended product.


          Year: 2010 Submodel: GT

          Helpful (3)

        • 5/5

          February 27, 2018

          Making it all fit

          changed shaker 1000 for kicker subwoofer and all fots great !


          Year: 2007 Submodel: Other

          Helpful (6)

        • 5/5

          December 29, 2017

          Chassis x-brace

          Well to be honest if you have the right tools you can finish this job really quick 30 minutes tops I combined the brace the the sr rear shock brace and it’s a nice combo and it does improve handling significantly.


          Year: 2014 Submodel: GT

          Helpful (4)

        • 5/5

          August 21, 2017

          Works awesomely!!

          It stiffens the cars where it really needs. The car is actually quieter too. The install was very easy. I used a stepped drill bit and was done in about 35 minutes. Upon driving, the first thing I noticed was how solid the car felt, even in mild cornering. In more agressive cornering, the added bracing let me rear suspension go to work and do its job. I was utterly amazed at the improvement. One week later, Im still amazed!!


          Year: 2014 Submodel: GT

          Helpful (4)

        • 1/5

          June 07, 2017

          did not fit my set up

          if you have the shacker 1000 stereo with the subwoofer it will not work for you, it would have been nice to know that, also you have to drill into your car to mount. But other then those welds and metal heavy duty and ready for bashing.


          Year: 2005 Submodel: GT

          Helpful (5)

        • 4/5

          May 25, 2017

          Nice piece easy install

          Nice piece, easy install, you will need four additional hardened washers for the install, but thats minor.


          Year: 2013 Submodel: GT500

          Helpful (4)

        • 5/5

          April 01, 2017

          Steeda Rear Chassis X-Brace

          This was a HUGE improvement! Car is just much tighter now. No floating down the hi way! Well worth it and it looks badass!


          Year: 2013 Submodel: GT

          Helpful (3)

        • 5/5

          January 13, 2017


          Awesome fit, I combined this with a steeda front tower brace, feels a lot tighter.


          Year: 2007 Submodel: GT

          Helpful (4)

        • 5/5

          January 11, 2017

          Simple install, big improvement in stiffness

          I installed this on my 2012 Boss 302. This was a simple install. I did not need to jack up the car. Be sure to use 1/2inch drill bit, otherwise the bolts wont go through the holes. Tightening the shock bolt/bushing was a bit tricky. I ended up using 18mm wrench to hold the shock and used the 9mm wrench at the top to spin in reverse to tighten the shock. The X-brace had an immediately obvious impact on the stiffness of the car and improved handling. I am very happy with this product. It is extremely well-engineered.


          Year: 2012 Submodel: Boss

          Helpful (8)

        • 5/5

          January 07, 2017

          wish i purchased sooner

          one of the best upgrades for the dollar. easy install and a big difference. might hear some creaking if you have taken the seats out in the back. looks great as well!


          Year: 2013 Submodel: GT

          Helpful (4)

        • 5/5

          December 04, 2016

          good product

          I have a 06 gt did not fit with stock hoes like it said had to drill and make my own pretty easy to do overall fit perfect though


          Year: 2006 Submodel: GT

          Helpful (5)

        • 5/5

          October 17, 2016

          Steeda x brace

          The x brace is awesome definitely worth it. Lap times improved at Laguna seca!


          Year: 2007 Submodel: GT

          Helpful (5)

        • 5/5

          August 08, 2016

          Easy install

          This was an easy install and you are able to keep the rear seat on place. I have the Shelby Kicker subwoofer and the brace fits fine.


          Year: 2007 Submodel: GT

          Helpful (6)

        • 5/5

          May 19, 2016


          I combined the Steeda rear chassi X brace along with the SR performance rear shock tower brace to tighten up the rear ended. I have the front shock tower brace and the Eibach pro system plus suspension kit. I added a double adjustable panhard bar, and double adjustable rear upperand lower control arms. My mustang goes where I put it. I'm confident going into now. Before I tightened up the rear end it was really lose and a little sketchy taking tight corners. I highly recommend these mods!


          Year: 2012 Submodel: V6

          Helpful (9)

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