With the release of the new 2024 Ford S650 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, we knew there would be an excellent 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 moves, twists, or vibrates when it should be stationary, it is a major problem. One of the areas that 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 S650 rear suspension to another level!

Our Steeda S650 Mustang Rear IRS Subframe Braces for 2024+ Fastback coupe Mustang 5.0L GT and 2.3L EcoBoost, fastback coupe (non-convertible) is built in-house from 4130 chrome-moly steel and powder coated silver metal-flake, this part isn’t only vital – it also looks great under your new Mustang! What we did was tie together 3 very important points on the S650 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 adds rigidity that was lacking in the rear and more control of the whole car.

Also, unlike competitor’s 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, providing twice the support! The 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.

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