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

14 Review(s)
$60.00 (18%)
Steedas S197 rear chassis X-brace 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 rigidi
Part Number: 555 5093
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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

CA Residents: Cancer and Reproductive Harm WARNING

Fitment & Features


Manufacturer: Steeda Autosports
Made in USA: Yes

Installation Information:

Level of Difficulty: Easy
Install Time: About 1 Hour
Tools Required: Basic Shop Tools
Print Instructions:

Vehicle Fitment:

Fits Model Year: 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014

Customer Reviews

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Average Customer Ratings


Another GREAT part from Steeda
Another GREAT part from Steeda. It really stiffens the car up, The suspension works SO much better, It feels like a different car with the X brace and the Torque Box/Frame rails stiffeners. People, Have this installed in you car, you won't be sorry.
Did you find this helpful?  4 of 5 Found Helpful
from Texas on 10/2/2016
Fits perfectly
Fits perfectly. I had it welded in for maximum performance and stability. So far had it installed for a week without any issues. The X-Brace does exactly how it should perform; stiffens the rear not on straights but on turns. It also helps with stability on bumpy roads creating a smoother ride and less interior noise.
Did you find this helpful?  7 of 7 Found Helpful
from Missouri on 5/29/2016
The X brace is one of the best mods I've made
I've had the best luck with chassis and frame stiffening. Each mod I've done has benefited both handling and ride compliance. The X brace is one of the best mods I've made. The interesting thing is, in addition to the improvement in ride compliance and handling that the steering has gotten lighter in a good way. Steering response has improved and I believe the "lightness" is possibly because the steering rack is not "fighting" chassis flex, it's more direct to the wheels now. Also, I have an aftermarket sunroof installed that had an occasional small creak going over curbs and now that small creak is gone, again probably due to decreased body twisting over curbs. Greet mod, should be first on the list for those who want to improve chassis rigidity. Also, it's great to still have the back seat. I have a 2014 pony package v6
Did you find this helpful?  1 of 2 Found Helpful
from Georgia on 3/13/2016
It's a different car.... unbelieveable
I have had this brace in my garage almost a year, dreading to install it because I am not little, and I knew I had to crawl in that little trunk of my 2012 Boss. I am sorry I put it off, it really wasn't that bad. I'll tell you if you have Coilovers (I have Penske Double adjustable) you have to reinforce the rear chock towers. It's a different car.... unbelievable. It may be my imagination but it even shifts better.
Did you find this helpful?  1 of 1 Found Helpful
from Utah on 1/9/2016
'13 BOSS Complete
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!
Did you find this helpful?  2 of 2 Found Helpful
from Montana on 8/15/2015
Excellent bang for the buck!
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!
Did you find this helpful?  1 of 1 Found Helpful
from Texas on 6/11/2015
Maintains the rear seats!
Awesome, genius product! It really stiffens up the chassis and lets you retain your rear seats!
Did you find this helpful?  3 of 3 Found Helpful
from California on 2/27/2015
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
Did you find this helpful?  3 of 3 Found Helpful
from Texas on 2/5/2015
The icing on the cake
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!
Did you find this helpful?  1 of 1 Found Helpful
from Florida on 4/5/2014
Great 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.
Did you find this helpful?  1 of 1 Found Helpful
from Texas on 3/14/2014
Fantastic Purchase!
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!
Did you find this helpful?  2 of 3 Found Helpful
from Florida on 1/2/2014
Great workmanship
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. Regards, Manuel
Did you find this helpful?  2 of 2 Found Helpful
from Georgia on 9/22/2013
Huge Improvement
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.
Did you find this helpful?  3 of 3 Found Helpful
from Alabama on 7/6/2013
Great for the Rear
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.
Did you find this helpful?  4 of 4 Found Helpful
from South Carolina on 4/29/2013
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