The key to all that extra power is Manhart's MHtronik Powerbox which sits between the original engine control unit and the ...

The X3 M’s cabin is equal parts luxury and sporty aggression - Merino leather feels posh, but the M badges and carbon-fiber trim hint at its ... Front and center is BMW’s iDrive 7 system.

Inside (we couldn't get photos of the interior, sorry!), BMW has added its sport ... and a whole mess of carbon fiber and Alcantara trim. But the M catalog isn't just about added flair.