Speed Week: BMW M4 vs Porsche Cayman GTS

This isn't any ordinary Cayman, either. It's the brand-new GTS: the first time the legendary Gran Turismo Sport badge has been stuck on the backside of the humblest Porsche coupe. As ever with Porsche, the badge isn't just a cosmetic addition: power is up by 15bhp to 335bhp, torque increases by 9Nm to 380Nm, and the GTS comes as standard with the Sport Chrono package - Stuttgart's performance-enhancing bundle that includes a clever system of active engine mounts which help stiffen the car's resolve when you're really on the doorhandles.