Everything was answered pretty well...

The only thing I would comment on is to be wary if you think about going with the C3 Pulley and a 181/185 Crank Pulley... This has not been proven and could prove to be a problem for the engine and ECU... I would consult with someone fluid in tuning and the M112 engine to discuss the potential hazards if you go this route...

As of my knowledge to date, I do not know anyone running both a larger crank pulley and a smaller SC pulley... SRT or AMG.

Like I said before, other than that everything else was well answered.