Dinan+ Performance Engine Software - 2015-2020 BMW M2 Competition/M3/M4 F80/F82/F83/F87. Designed for the stock S55 engine, this Dinan+ calibration is intended to increase power and improve drivability while removing the factory speed governor. It is calibrated for 91- and 93-octane pump gas and includes Dinan's factory-matching 4-year/50,000-mile warranty. Features: • S55 engine calibration • Designed for 2015-2020 BMW M2 Competition, M3 and M4 • Pump-gas calibration for 91 and 93 octane • No required hardware modifications • Factory engine safeguards retained • Factory speed governor removed • Dinan factory-matching 4-year/50,000-mile warranty Part Number: D900-S55-S1-W