The Mercedes supercharge off of the SLK230 is a M62 and has a 3.5†Diameter pulley. I am looking at a 8.5†drive pulley for 10.8 psi off boost.
I found this place for the drive pulley, I need to design my adapter.
https://www.rpmoutlet.com/lightaspm.htm
To calculate the boost on an Eaton supercharge use:
(Super Charger Disp * Ratio * 14.7) - 14.7 = Boost Pressure
(1/2 Engine Displacement)
One thing neat about the Mercedes supercharger is the electric clutch on the drive pulley. It would be possible to drive around with it in bypass for regular street driving, using low octane gas. When you want to show off, filler up with high test. Of course this would work best with FI or wet supercharge. All that is needed is to install a bypass around the supercharge with a check valve.