RK Autowerks S58 Stage 2 Turbo Upgrade – M2/M3/M4/X3M/X4M

DescriptionRK Autowerks Stage 2 Turbo Upgrade for S58Overview:The RK Autowerks Stage 2 Turbo Upgrade is designed for S58 owners who want significantly more power while maintaining stock-like drivability, fast spool, and full integration with OEM systems—including launch control. This setup is ideal for street and track use, offering a reliable path to 900 WHP when paired with the right supporting modifications.Built In-House:Each unit starts with OEM turbocharger cores. We precisely machine and modify the housings on our in-house 5-axis CNC mill to accommodate upgraded internals. This method preserves OEM fitment and results in a true bolt-on turbo solution—no cutting, no adapters, no surprises.Performance Highlights:Supports 40 PSI of boostDelivers 900 WHP with proper fueling and tuningRetains OEM spool characteristics and drivabilityMaintains factory launch control functionalityCNC-machined & assembled in-houseDirect bolt-on using factory mounting pointsNo tuning included – intended for experienced tuners or shopsVehicle Compatibility:BMW M2 (G87) – 2023 BMW M3 (G80) – 2021 BMW M4 (G82/G83) – 2021 BMW X3M (F97) – 2019 BMW X4M (F98) – 2019 Core Exchange:OEM turbo cores are required with your purchase. Your upgraded units will be built using these cores unless otherwise arranged. If you are sending in cores for rebuild, please allow for 1–3 business days turnaround depending on our current queue.Important Disclaimer:Do NOT use factory inlet pipes.Use upgraded inlets that match your intake system. Failure to do so will void warranty and disqualify your unit from exchange.Why Choose RKRK Autowerks manifolds are engineered and built in-house in Fort Worth, TX. We don’t outsource. Every unit is CNC-machined and hand-assembled for precise fit and performance. Trusted on street builds and world-record track cars alike, this is the same manifold platform we use in our own 1000 WHP vehicles.More information and dyno results coming soon.Click Here For Warranty Info