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What’s this, then? This lights-and-stickers BMW M4 is the vehicle tasked with policing MotoGP’s unhinged biking talent when someone’s had an off. So it has to be a bit quick and tasty, given the speeds of which the two-wheeled loons are capable. BMW’s M Division hasn’t taken any chances with this M4 then, equipping it not just with brakes, a roll cage, Recaro bucket seats with six-point harnesses and KW coil-over suspension, but an experimental water-injected version of its turbocharged six-cylinder engine. Water-injected? H2O and combustion might be uncomfortable bedfellows, water’s inability to compress meaning it’ll grenade an engine if it gets inside. So here BMW M uses water in the turbo system, cooling the charge air, which in turn allows the engine to run at greater compression, and those turbos to run higher boost. It’s all to the benefit of not just performance, but economy and emissions, too.