Steeda S550 Mustang Rear IRS Subframe Support Braces (15-17 Coupe)

Steeda S550 Mustang Rear IRS Subframe Support Braces (15-17 Coupe)

$239.95
$279.95
$40.00(14%)

555 5754

Product Install Instructions

With the release of the new S550 Mustang, Steeda knew that addressing the IRS system would be a top priority. Being the first production Mustang with an IRS since the 03/04 Cobra's, we knew there would be a great opportunity to capitalize on Ford's new piece by giving it the Steeda advantage. As with any suspension system, deflection is an issue if it's present. Anytime a piece is moving, twisting or vibrating when it should be stationary is a major problem. One of the areas team Steeda wanted to focus on was the rear IRS subframe.

As you have seen with our IRS Subframe Bushing Support System, it limits the movement of the subframe by filling in the voids of the OE bushings. With Steeda's IRS Subframe Support Braces, we have taken the S550 rear suspension to another level!

Our Steeda S550 Mustang Rear IRS Subframe Braces for 2015-2017 Mustang GT, GT350, EcoBoost, and V6 (non-convertible) is built in-house from 4130 chrome moly steel and powdercoated silver metal flake, this part isn't only strong - it also looks great under your new Mustang! What we did was tie together 3 very important points on the S550 chassis. We utilized existing threaded holes in the rocker panel (the strongest part of the body) and connected that to the front mounting location of the IRS subframe and the rear mount of the lower control arm and toe link. Connecting these 3 points together not only adds rigidity that was lacking in the rear, but also more control of the whole car.

Also, unlike competitors kits that have not been released yet and only replace the factory bracket, our Steeda kit supports that bracket while connecting to 2 additional locations, therefore providing twice the support! Best part about this kit is it uses all existing holes in the chassis so the car doesn''t have to be modified in any way and adds no NVH whatsoever.

Product Benefits

  • Better handling for more stable cornering
  • Limits IRS sub frame movement
  • No permanent modifications necessary
  • No added NVH
  • 50% more connecting points
  • Reduces wheel hop
  • Lifetime warranty
  • Installation does not require removal of cradle
  • Patent pending

Purchase your Steeda S550 Mustang Rear IRS Subframe Braces for your 2015-2017 Mustang GT, GT350, EcoBoost, and V6 (non-convertible) at Steeda Autosports today!

What a difference theses Steeda sub frame connectors made
Honestly, I did not think this suspension mod would do much for my slightly modded 2015 GT. The car has a CAI, GT350IM, long-tubes on back with 3.55 gearing from the factory. So not exactly a high horsepower car but enough to cause excessive wheel hop on throttle blips. What a difference theses Steeda sub frame connectors made, I was not expecting this. The car accelerate, within reason, without the back end jumping loose every time. Some better tires and it would really tie it all together in a very simple package. The coonectors are well made, high quality
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Reviewed by:  from . on 4/2/2017
5/5
you can add this subframe brace for not only extra wheel hop prevention, but also improved handing
There's always this debate as to whether S550 owners should get the competitors lockout kit or this for wheel hop. The most directly comparable solution from Steeda to the competition's lockout kit, IMO, is the IRS alignment inserts + IRS bushing supports. Then you can add this subframe brace for not only extra wheel hop prevention, but also improved handing and driver confidence on the street or road course. This brace also works in tandem with the aforementioned parts to keep the IRS straight and solid during launches at the drag strip and it does so from hard points on the IRS and using Ford factory subframe bracing locations, not with a bracket that slips into the IRS cradle bushing and with a steep angle connects to the vehicle frame with small 35 torque bolts going through slotted holes in the same direction as the movement its supposed to prevent. Look, they are two different approaches with a similar goal. I chose Steeda's solution because I road course my car and even a novice that's spoken to just a few seasoned road course vets knows that triangles make a subframe better.
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Reviewed by:  from . on 3/25/2017
5/5
no more wheel hop
I installed mine with the weight of the car on the tires (I have a 4 post lift). Everything lined up perfectly on the driver's side, the center hole was off just enough on the passenger side that I was concerned I would cross thread the fastener if I forced it but I was able to easily lever it into alignment with a screw driver.
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Reviewed by:  from Florida. on 12/10/2016
5/5
car should drive like this out of the factory!
I spend Sunday installing Steeda's front and rear sway bars (with billet aluminum sway bar bushings) on my 2015 GT PP. This is in addition to the progressive springs and sub frame bushing supports that are already installed. The installation of the rear parts were easy while the front was more tedious but not impossible for the average mechanically inclined person. I opted for maximum stiffness on the sway bars for the best handling performance. visibly there is a huge difference in the side and quality of the sway bars. Steeda's are much more stout and the bushing are significantly stiffer, the mounts are lighter (based on the standard mounts that come with the sway bars) but a much better design. The sub frame braces look like the perfect way to tie the IRS sub frame into the vehicle and "tighten things up". The brace connects near the jack points on each side to two points on the sub frame and one point in between creating a triangle for some serious stability. This is a tight fit so make sure you follow the instructions from Steeda and keep the bolts loose until things are set. I haven't had the car on the track yet, but there is a huge difference in just daily driving. I've hit a couple of curves hard and the car seems to dive into them and there is much more confidence in the car. I hit a pretty sharp curve the last 2 days on my way to work and I don't feel any understeer at all (at least I can't tell) I was doing between 60-70 mph through the turn it just felt nice! All in all I made a great choice. Steeda should have sold these to ford during manufacturing and the car should drive like this out of the factory!
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Reviewed by:  from Texas. on 11/9/2016
5/5
Completely different experience
I put the car to a slight test this morning on my way to work. I usually take this one turn at about 60mph and I can feel the car pulling, today I hit it at 70mph and the car felt like it dove into the turn. completely different experience in a very positive way.
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Reviewed by:  from Pennsylvania. on 10/14/2016
5/5
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