The "Evo II" included the AMG PowerPack fitted to the same short-stroke 2,463 cc (2.5 L) inline-four engine as the Evolution, producing a maximum power output of 235 PS (173 kW; 232 hp) at 7,200 rpm and 245 N⋅m (181 lb⋅ft) of torque at 5,000 rpm, as well as a full SLS adjustable suspension allowing the ride height to be adjusted from an interior switch. An obvious modification to the Evolution II was the radical body kit (designed by Prof. Richard Eppler from the University of Stuttgart) with a large adjustable rear wing, rear window spoiler, and Evolution II 17-inch alloy wheels. The kit served an aerodynamic purpose—it was wind tunnel tested to reduce drag to 0.29, while at the same time increasing downforce. Period anecdotes tell of BMW research and development chief, Wolfgang Reitzle, saying "the laws of aerodynamics must be different between Munich and Stuttgart; if that rear wing works, we'll have to redesign our wind tunnel." The anecdote claims that BMW did redesign its wind tunnel afterwards.[18]