The S55's twin-scroll turbos have serious potential, but BMW's conservative factory tune leaves 100+ horsepower trapped in the ECU. Stage 2 unleashes your M3/M4's full fury with aggressive mapping that transforms boost response and power delivery across the entire rev range. Performance Gains Stage 2 tuning rewrites the S55's boost strategy entirely. Peak boost climbs from factory 18.5 PSI to 22-24 PSI, with extended high-boost zones that maintain power through redline. The twin-scroll turbos spool harder and hold boost longer, eliminating the mid-range dip that plagues stock S55s. Throttle response sharpens dramatically — the engine now reacts like the twin-turbo monster BMW designed it to be. Expect transformed acceleration with power delivery that pulls relentlessly from 3,000 RPM to redline. Fitment S55 (2014-2021): F80 M3, F82/F83 M4, F87 M2 Competition Installation & Supporting Mods Stage 2 requires a quality intake and downpipes to handle the increased airflow and exhaust volume. The tune is delivered via our proprietary flash tool — simple plug-and-play installation takes 15 minutes in your driveway. We include detailed install videos and provide direct text support throughout the process. Need help planning your build or stuck mid-install? Text us at 813.252.1025 — we will walk you through it. Shipping Free shipping to the lower 48 states. International shipping available — contact us for a quote.
