With the release of the new 2015 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+ Fastback (non-convertible) coupe Mustang 5.0L GT, 5.2L GT350, 2.3L EcoBoost, and 3.7L V6 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.

PATENT NO.: US D784,211 S

See the IRS Support Braces in action in our Steeda Q500

Notice how composed our Q500 is throughout this turn at Palm beach International Raceway

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

Also fits the S550 GT500

Note: IRS braces do not fit convertibles.

You asked and Steeda listened! The team here at Steeda went hard to work when we started fielding calls of the rear subframe being misaligned from the factory and there being no solution with the BMR CB005 / SR Performance IRS Tie Down kits. So here you have it, Steeda's new S550 IRS subframe alignment kit for the BMR CB005 / SR Performance IRS Tie Down kits!

The S550's subframe mounting holes are very large compared to the subframe mounting bolts. Since there is a large difference in bolt and hole size, the subframe can be mis-aligned from the factory up to 1/2" left to right. The Steeda S550 Mustang IRS Subframe Alignment Kit is made from CNC-machined Delrin to avoid putting two dissimilar metals next to each other like the competition, preventing corrosion. Delrin is also less weight then aluminum or steel inserts and therefore keeping performance in mind. The Delrin sleeves slide into the subframe mounting holes, and fill the extra space left between the subframe mount and bolt from the factory.

Our Steeda S550 Mustang IRS Subframe Alignment Kit guarantees that the subframe will be bolted to the same location every time it is lowered. Eliminating the need for unnecessary alignments.

Note: Note: An alignment is needed upon initial installation, due to the fact it could have been mis-aligned from the factory and with it now being squared in the chassis, some adjustments might need to be made. This part is designed to fit with BMR CB005 & SR Performance IRS Tie Down Kits. Purchase your Steeda Alignment Kit for the S550 Rear Subframe for BMR CB005 / SR Performance for your 2015+ Mustang at Steeda Autosports today

Solidify the IRS on your 2015+ S550 with Steeda's HARDCORE Subframe to Body Bushing Kit. CNC machined and made from billet 6061-T6 aluminum, these mounts eliminate all subframe movement, improving traction and handling while also reducing wheel hop. The unique cut-outs ensure that this is the lightest kit on the market while at the same time not sacrificing strength. The Steeda HARDCORE S550 Mustang Subframe to Body Bushing Kit is a must for the driver hitting the track or strip and want to lock the IRS in place.

Product Benefits:

• CNC machined 6061-T6 aluminum
• Eliminates all subframe movement
• Improves traction and handling
• Reduces wheel hop
• Lightest kit on the market

Steeda has come out with a kit that all S550 Mustang customers have been waiting for.. The Steeda S550 Subframe Alignment and Bushing Support System!

We combined our ever so popular 555 4438 and 555 4437 kits into a money savings combo kit where you the customer benefits! The S550's subframe mounting holes are very large compared to the subframe mounting bolts. Since there is a large difference in bolt and hole size, the subframe can be mis-aligned from the factory up to 1/2" left to right. The Steeda S550 Mustang IRS Subframe Alignment Kit is made from CNC-machined Delrin to avoid putting two dissimilar metals next to each other, preventing corrosion. Delrin is also less weight than aluminum or steel inserts and therefore keeping performance in mind. The Delrin sleeves slide into the subframe mounting holes, and fill the extra space left between the subframe mount and bolt from the factory therefore eliminating any movement. Our Steeda S550 Mustang IRS Subframe Alignment Kit guarantees that the subframe will be bolted to the same location every time it is lowered. Eliminating the need for unnecessary subframe alignments.

These Steeda S550 Mustang IRS Subframe Bushing Support System for your 2015+ Mustang GT, EcoBoost, and V6 gives the rear end a much more solid feel with no increase in NVH at all. The Steeda IRS Subframe bushings eliminate rear subframe movement notorious in the S550 Mustang GT, EcoBoost, and V6. A stiffened subframe allows the car to increase traction to the rear wheels and is the first step towards eliminating wheel hop. The Steeda S550 Mustang IRS Subframe Bushing Support System for your 2015+ Mustang GT, EcoBoost, and V6 are easy to install, with basic hand tools. The Steeda IRS bushing kit also does not require any permanent modifications to the car.

PATENT NO.: US D784,881 S

UPR Billet IRS Subframe Braces for 2015-2019 Mustangs. CNC Billet IRS Subframe Braces work with or without an IRS lockout kit and stabilizes the IRS subframe to the body of the car. This replaces the flimsy stamped steel factory brace that is known to twist.

Product Features
* 2pc Kit
* Machined Finish
* Improves Handling
* Reduces Wheel Hop
* Improves 60ft Times
* 15 Minute Installation
* CNC Machined from 6061 Billet Aluminum