BMW Z4 sDrive 35is has one of the greatest engines BMW has ever built. Still, Kelleners Sport knows ways to make it much better.

The standard 3.0 liter twin-turbo six-cylinder makes a healthy 305 hp and 450 Nm of torque, fairly enough for a nice and sporty roadster. Kelleners’ version though, offers a hundred more, 405 hp and 540 Nm. That’s the power of a big V8 you get in a compact sportscar. Awesome!

That said, the tuner has not done much upgrading chassis and brakes to cope with the extra power. It just gets a set of 19 or 20-inch wheels in two different designs, and lowered suspension, 20mm at the back and 10mm at front.

They’ve paid more attention to the interior where you will find custom steering wheels, leather and wood trims, aluminum pedals, and special floor mats.