Here is my TrailBlazer SS, it is just loud enough to keep anyone from wanting to play anymore. You can hear a hum even at idle and light cruise. I am running 17 PSI of Boost now with the same MP122HH, it is a Front Inlet/Rear Drive, Overdriven Rear, 3.1 Front Pulley and 8" Crank with full 8 Groove Belt System.

Here it is now with a overdriven MP122HH at 15 PSI of Boost:



Here it was with a MP112 at 8 PSI of Boost: