The "Evo II" included the AMG PowerPack fitted to the same short stroke 2.5 engine as the Evolution, as well as a full SLS suspension allowing vehicle ride height to be adjusted from an interior switch. Again the most obvious modification to the Evolution II is a radically designed body kit designed by Prof. Richard Eppler from the University of Stuttgart, with a very large adjustable rear wing, rear window spoiler, and unique Evolution II 17 inch wheels. That body 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 a BMW executive who was quoted as saying "if that rear wing works, we'll have to redesign our wind tunnel.". The anecdote claims that BMW did.