... another conversation with the SM yielded slightly better results; he is going to contact the local benz dealership to see if they can have a look at the car.

I verified that the throttle body gasket was checked for leakage. Additionally, according to the official Chrysler parts catalog/SM, the supercharger is listed as an assembly, so the blower & clutch assemblies were replaced.

He said its safe to rule out the supercharger as the issue. He thinks its got to do with the air/fuel maps & wished he had another srt6 would come in for service so he could compare the two. Wouldn't that be something he could get from Chrysler?

I too tested the gasket with a buncha throttle body cleaner. No increased rpm.

I'll wait to head back from SM, see if the car can go to MB

thanks 24x7, however it looks like its gunna be a while til you get nice weather.