The F80 M3 marked a significant shift for BMW ... N55 turbocharged engine producing 365 horsepower, while the later M2 Competition models received the S55 engine from the M3/M4, boosting output ...

Using the F87 M2 Competition as its starting point, the CS raised that car’s power limit to 444bhp, matching the F80 M3 Competition from whence the S55 twin-turbocharged straight-six was sourced.