BMW M5/M8/X5M/X6M F90/F91/F92/F93/F95/F96 S63TU Tune

Racebox S63 Custom Tuning — BMW M5, M8, X5M & X6MEvery S63 Racemode tune is a custom MHD calibration built for your exact car, mods, and fuel, flashed from home with the MHD app and a WiFi adapter. On our Dynojet, a stock-turbo S63 makes around 680 whp / 680 wtq on 93 octane and 750 whp / 750 wtq on E30 flex fuel. You get a 1–2 business day response and 30 days of tune revisions from your first datalog, with OEM safety limiters retained.S63 Power (whp, Racebox Dynojet) Setup Fuel Power (whp) Custom tune, stock turbos 93 ~680 Custom tune, stock turbos E30 ~750 Upgraded turbos E-fuel Custom targets — contact us Every dyno chart we publish lists the ambient conditions and correction factor. Real numbers, no fluff.Which tune should I pick? Custom Stock Turbo Gasoline — 93 octane on stock turbos (~680 whp). Custom Stock Turbo Flex Fuel (requires flex fuel kit) — E30 blend on the stock fuel system (~750 whp). E85 / higher ethanol needs HPFP/LPFP upgrades. Custom Upgraded Turbo — for upgraded turbochargers and supporting mods; fully custom targets, logged and revised to your build. Tuned entirely on MHD. Reach out and we'll map a plan for your S63.