BMW’s ‘B58’ engine is a 3.0-litre turbocharged straight-six with lots of potential, and Manhart’s latest upgrade for the G42 series M240i looks to exploit just that with a significant power bump.

As is the case with most BMW vehicles, 2 Series buyers choose between two fine turbocharged powertrains: a 255-hp, 295 lb-ft 2.0L turbo four (230i xDrive) or 3.0L turbo inline-six (240i xDrive ...