Starting with the exterior, carbon fiber bits are the most noticeable additions, with the lightweight material added in the form of a massive front splitter, mirror caps and a rear spoiler. Other visual changes include lightweight 20-inch wheels, a blacked-out grille, and unique M Performance side stripes. No, that's not a shadow you see under the 435i's strong side character line – that's a stripe. Yes, we're serious.
Inside (we couldn't get photos of the interior, sorry!), BMW has added its sport steering wheel with race display, unique M floormats, steel pedals, and a whole mess of carbon fiber and Alcantara trim.
But the M catalog isn't just about added flair. Legitimate performance parts can be had, and for starters, this 435i is fitted with a power kit that increases engine output from 300 horsepower and 295 pound-feet of torque to 334 and 332, respectively. Building upon that, there's a limited-slip differential, performance suspension, upgraded brakes with red calipers and a rear apron diffuser finished in carbon.
BMW hasn't announced official pricing for the 4 Series goodies as of this writing, but we should have a clearer idea of how much coin each option will warrant closer to the kit's debut at the Frankfurt Motor Show this September. Until then, have a glance through our gallery of live photos to take it all in for yourself.