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

Market Price $313.99 You Save 11% ($34.04)
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  • Item 101162
  • MPN# 555-5093

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Features & 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
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

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

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

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Most Helpful Reviews


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 ...

Read More
Helpful (4)

Steeda x brace

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

Helpful (2)

Overall Rating 4.7 out of 5 stars
Read All 19 Reviews

Customer Photos (12) Submit Your Photo

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5 Questions / 5 Answers

Ask a Question

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 (6)

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)

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 (1)

Which would be give a stiffer suspension this X-Brace, or a rear strut tower brace in combination with a Seat removal* X-Brace


  • The Steeda Rear Chassis X-Brace - Coupe (05-14 All) generally gives a stiffer suspension because of its construction. The X in the middle will absorb impact. The X-Brace is definitely more rigid than the Steeda Rear Shock Tower Brace (05-14 Coupes), item # 16155, (


Helpful (0)

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?


  • Unless you're tracking this car all the time this upgrade is not for you. You actually want some flex back there. Yes your amps would interfere with this. If you're mainly on the street I would recommend the rear shock tower brace if you feel you need bracing back there.


Helpful (0)

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Customer Reviews (19) Write a Review

Overall Rating 4.7

out of 5 stars

  • 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 (4)

  • 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 (2)

  • 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 (2)

  • 5/5

    December 19, 2014

    Looking for Perfection

    The Steeda Rear ChassisX-Brace balances and distributes the stresses induced by each of the shocks through-out the rear of the chassis. Once you view the installation the lightbulb will flash for you. Engineered perfection! And, if you're serious about occasional road course adventures, this bolt-on X-Brace will surely impress you. Best of all you'll maintain the option of keeping your rear seats functional and intact. I believe you can expect longer than normal longevity from all components attached to this X-Brace. Feel and hear the difference.


    Year: 2005 Submodel: GT Northern AZ

    Helpful (2)

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 5/5

    January 27, 2015

    As always with Steeda

    This is a well made part and performs as expected when it comes to Steeda parts. However, you are going to need an air impact to tighten up the top shock mounts. Even with an electric impact, I was not able to get both snug and tight...just keeps spinning the shock stud around and around. Anyhow, with an air impact, this is a one hour job..tops!


    Year: 2013 Submodel: GT Conroe, TX

    Helpful (1)

  • 5/5

    October 24, 2014

    X marks the rigid spot

    I was pleasantly surprised when I received this brace. I did not expect it to be so heavy duty and still very light in weight.With this and the front strut tower brace, my stang handles like a whole different machine, like its on rails. Thanks AM, you did it again, quality products at a fair price!!


    Year: 2014 Submodel: V6 anchorage ak.

    Helpful (1)

  • 5/5

    October 21, 2014

    Steeda X-Brace

    Awesome x-brace. Retain back seat, retain most usuable trunk space, increase handling, super look, and relatively easy install. (Tight work space in trunk, but no jack needed. Feel right into place.) Considering all this, why wouldn't you...


    Year: 2008 Submodel: GT North Carolina

    Helpful (1)

  • 5/5

    June 03, 2014

    quiets some chassis noise.

    It arrived well packaged with detailed instructions. Took me about 1.5 hours to install. I would recommend using a 1/2 inch drill bit instead of the recommended 7/16. Once I took it out for a test drive I immediately noticed I difference in chassis stiffness. Be prepared to lose some trunk space, however.


    Year: 2010 Submodel: GT Toronto, ON, Canada

    Helpful (1)

  • 5/5

    May 27, 2014

    You need this

    Great quality, looks, performance and price, and with the Steeda name, you can't really go wrong here. Very easy to install and does the trick.


    Year: 2008 Submodel: Other Texas

    Helpful (1)

  • 5/5

    April 18, 2014

    Steeda x brace

    Amazing how easy it is to install and once installed the difference is instant. Take corners with confidence. Looks great not outa place and retains the trunk space


    Year: 2013 Submodel: GT Mukwonago WI

    Helpful (1)

  • 5/5

    March 24, 2014

    Steeda Rear Chassis X-Brace

    This is a very quality manufactured part. Install is a breeze, I didn't have to use a jack to install it like the directions say. I can definitely tell there's a difference in the way the car handled prior to the install, to after. On to the next add-on :)


    Year: 2007 Submodel: GT Grayslake, IL, USA

    Helpful (1)

  • 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 (0)

  • 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 (0)

  • 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 (0)

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