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BMW petrol engines
What is the difference between the M20B25 and other M20 engines?
The M20B25 makes 126 kW (171 HP) and 226 Nm. The other M20 engines are: M20B20 with 95 kW (129 HP) and 174 Nm (1977 to 1992).
Engines in one family share a basic block, but the turbo, the injection, the sensors and the engine computer can differ. A higher power version often has different pistons, a bigger turbo or a different fuel system.
This is why we ask for the exact code. Fitting a different version can work, but the wiring, the software and sometimes the gearbox must be changed to match.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.