Yep. Mercedes CLK series 6 speed manual, 16v flywheel and spec clutch.
The 6 speed is a nice, tight Getrag unit that, iirc, is used in many a bimmer as well.
Though I'm quite sure I'm going back to the 3.2 displacement. Stock motor at 18psi netted 499rwhp @6500. That's without major computer tuning, basically a 'rough' tune which is plenty of go to hospitalize me sufficiently quickly.