Why has the M235i become the M240i? With no revisions to the architecture underneath the answer can be found in the bonnet. The well-known turbocharged, 3.0-litre straight-six has been fiddled with and now produces 335bhp (or 340PS, hence the name) rather than the old model’s 320, but it also produces 369lb ft (500Nm) of torque at just 1,520rpm, a not inconsiderable raise of 37lb ft over the 235. Those two changes make all the difference. In fact, that engine is an absolute tour-de-force, able to pull happily in any gear and very nearly treading on the toes of the M2. Extra work from BMW has meant that the lag from the twin-scroll turbo goes by almost unnoticed. If you need to pull away from something, be it a corner or someone who’s taken your BMW badge as a free reign to tailgate, there’s no grasping for a lower cog, just put your foot down and the six-pot will haul you away. But that almighty torque low down doesn’t compromise the top end, when the power comes through the engine sings its way up to the red line, and never stops tugging. In the twisty stuff, the 240 retains the outgoing model’s lively character, dancing around at your control without ever leaving you nervous to attack the road. Perhaps the only letdown is the manual gearbox, normally a boon to the purist in a car like this, but BMW’s box retains an uncomfortable level of spring, which makes the stick feel like it travels much further than it actually does, not bringing the satisfying slot we crave.