In the BMW 1M, the N54 engine received changes to its turbochargers, exhaust system, and a revision of its ECU. The muscular coupe also had an over-boost function that temporarily increased its ...

BMW’s 1-series M Coupe of 2011-2012 ... a Pipercross filter (£859), and a titanium Akrapovic exhaust (£6156). Together they take the 1M from its standard 335bhp and 369lb ft of torque to ...