some guy on one of the MBZ forum stated...

" RENNtech has added a supercharger onto a stock 320 engine and than bored to a total displacment of 3.8 L (~3,800cc). It's just the ML320 piston and sleeve kit from MBZ. This resulted in a total of 440 bhp, 420 lb/ft of torque...the key to this all is that they did this on a 6 speed manual tranny, but what surprised me was that the manual tranny could handle that much bhp. I was told there were no upgrades for it; however RENNtech upgraded to a Sachs twin-plate clutch and single-mass flywheel.." you could easilty add another 40 hp to that number if it was turbo charged.

these guys are on the east coast and can install it if your not handy with the wrench http://www.pes-tuning.com/