Originally Posted by woodlands1
I believe for the SRT-6 you would likely want to use 348HP for calculations as that is the stated HP for the look alike MB AMG engine. I suspect it was an internal Daimler Chrysler political decision to assign a lower HP number to the "inexpensive" Chrysler SRT-6 engine. The company sure wouldn't want to lessen the preceived value of the SLK 32 AMG roadster by having a cheap Chrysler product with the same HP.
BTW, the normally aspirated SLK320 engine makes 215 HP according to MB. The same as the look alike XFire 3.2L NA engine.
You're right, 350 for the SRT and 215 for the base, but that is hp measured at the crank, not at the wheel. You have to factor in 17-18% drivetrain loss. I figured 18% to be conservative, which gives 287 for the SRT and 176 for the base.