Pity the German companies who make their living 'tuning' mainstream motors. All the big German manufacturers (save Porsche) now have their own in-house performance divisions. Audi has its S, BMW has its M, Volkswagen has its R, and Mercedes has its AMG. Your local dealer will sell you an extra hot version of any basic model, complete with warranty and a choice of body mods. It's hard to see what an independent tuner can bring to the party.
Case in point: the Mercedes Benz AMG SL55. Why would anyone would want more muscle in a car that pumps out a colossal 500bhp @ 6100rpms? The SL55's V8 Kompressor also generates an epic 516lb.ft. of torque at 2650 - 4500rpms. In other words, Mercedes' uber-SL is fully capable of hurling its occupants from any speed, to any speed, without hesitation, deviation or repetition. In fact, the svelte-looking SL55 is one of those rare machines that can turn forward thrust into physical pain.