Steeda Mustang Rear IRS Subframe Support Braces
These IRS braces connect the sill structure, front subframe mounting point and rear lower-control-arm/toe-link mounting area. The three-point connection restricts rear subframe movement and helps reduce wheel hop.
Made from 4130 chrome-moly steel with a silver metallic powder coating. The original bracket remains supported, while the kit adds connections using existing chassis holes. No permanent alterations are required. Steeda reports no additional NVH and lists European ECE approval. Compatible with Steeda jacking rails.
Instructions and videos
Fitment and installation note
S550 2015–2023 and S650 2024-on V8/EcoBoost coupes, manual or automatic. Not for convertibles, which already have a similar factory brace. Steeda notes a rear-bolt torque adjustment for the lighter EU rear subframe. Confirm the correct torque for the vehicle using the installation guide or Steeda’s technical advice.
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