Browse Parts →
American Mustang Performance Parts

Hours:  M-F 8-6 EST, Sat 9-1 EST

Mustang Performance Parts

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

Our Price $279.95
Market Price $339.95  
You save $60.00 (18%)
280 points

Manufacturer  Steeda Autosports

Add to Build List
  • Product Description
  • Installation Info
  • Mustang Fitment

Our latest rear chassis X-brace addresses the fact that not everyone wants to get rid of their rear seats for the added benefit of the rear chassis brace. Obtaining the rear seat delete parts from the Boss 302 can be an expensive task, and having a rear seat delete made can be a challenge as well.

After listening to these concerns from our customers, the result is our Steeda Rear Chassis X-brace that does not require a rear seat delete. This brace installs in the chassis area between the rear wheel wells behind the rear seats which effectively couples this part of the rear structure together to increase chassis rigidity.

Besides engineering the benefit of not having to get rid of the rear seats, this design is a significant improvement over Ford's original design for the Boss 302. Our X-brace mounts to the rear shock towers instead of attaching to the sheet metal behind the rear seats. This design is more effective and distributes the loads between the rear shocks, springs and the chassis, and not just the sheet metal of the vehicle. The result is much more effective chassis deflection reduction with improved suspension compliance over a sheet metal mount design.

This brace can be used as a bolt on installation or welded for maximum effectiveness.

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

Product Benefits

  • Allows the rear seats to be retained!
  • Much more effective than other designs
  • Bolt on or weld on installation
Time to Install
About 1 Hour
Level of Difficulty
Tools Needed
Basic Tools
Install Instructions
Instructions are in PDF format. Get the free Adobe PDF Reader, here.
Model Year(s)
2014 2013 2012 2011 2010 2009 2008 2007 2006 2005

Bullitt GT V6 GT500 Boss

Manual Automatic

Product Reviews

This was the cherry on top of the sundae! Super easy install. I decided not to cut the side-carpet, but instead just rolled it inward.

Nice touch receiving a thank you card, too!

Great fit and finish. Excellent bang for the buck! Was pretty straight forward to install. The directions were good. I can't wait to see how this effects the handling on the track!

Awesome, genius product! It really stiffens up the chassis and lets you retain your rear seats!

What a great idea!! Add an x brace and keep the rear seats!! Yes please! Great price for the convenience of keeping your rear seats. Oh yeah and the handling is great!lol

I have a lot of Steeda suspension parts on my car and this just tops it all off. I feel like it completed my handling project. The shipment came fast and when I opened it up it was beautifully designed. Thanks for an awesome product!

Nothing but good things to say about this X-brace. Great quality, installed easily, and I can definitely feel the handling improvement. Plus, it was a great place to mount my custom stereo amps!!! Lastly, great customer service.

This is a great product and what makes it better is that it looks great when you open the truck and you keep the back of both worlds. install was a little tricky and I would suggest air gun to removed the shock nuts and might need a little larger drill bit to fit for the bolts (unless you are welding). it makes a huge difference in stability, plants the live axle on the ground at high speed turns. definitely worth the time and money!

Ok, finished my install on the X Brace...not a one hour job for sure. Although I must say it is an awesome piece of work that Steeda did with this brace. FYI, if you have the diff catch can, you will have to relocate.


I can't believe how much this tightened everything up in the back of the car. It made a bigger difference than upgrading my rear sway bar. The back is firmly planted and steady in the corners. It even eliminated much of the clunks when driving over steep parking lot entrances.
The install took 2 hours only because getting the nuts on the bolts in the limited space is tricking if you have small fat hands. I didn't have to use a jack as the brace slide right over the shocks without any problem.

I can't think of a better upgrade to your suspension for the price.

Adding this made a huge difference in the stability and response of the rear end. It made a much bigger difference than upgrading the rear sway bar.