Here's the list of mods on the mercedes that ran that dyno. It from the thread over on mbworld.

The list is pretty long...

ECU, pulley, cams, upgraded intercooler with remote reservoir (two pumps), intake, headers, custom exhaust, LSD, brakes, wheels, springs, shocks, cosmetic stuff (grill, antenna, roll bars, wood trim), oil catch can. I think that is pretty much it