some info.....from
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SL55
The most potent supercharged Mercedes is the SL55 AMG. With a 5.4-litre V8 thumping out 350kW and 700Nm (from just 2650 rpm) that should come as no surprise!
The SL55 AMG’s highly efficient Lysholm-type supercharger (manufactured by IHI) features Teflon coated compressor screws and is driven at more than 23,000 rpm at an engine speed of 6500 rpm. At this speed, the blower displaces 1850kg of induction air per hour and generates up to 12 psi of boost pressure. The supercharger is also equipped with an electro-magnetic clutch that is used to switch it on/off depending on rpm and load. A water-to-air intercooler is also used to help achieve that magic 350kW.

SLK32/C32
Using a 3.2-litre V6, these cars apparently use the same Lysholm-type supercharger unit as the SL55. In this application, however, maximum boost is up to 14.6 psi and at maximum engine speed (6220 rpm) the blower is flowing up to 1200kg per hour of induction air. Interestingly, the blower does not engage at engine speeds above 3000 rpm due to the resulting belt stress. Maximum outputs are 260kW and 450Nm of torque.
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We believe there are four common sizes in the IHI Lysholm range – these displace 750cc, 1000cc, 1500cc and 1840cc per revolution.
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and this....from another thread....ex 2008/9
"........The OEM SRT6 Supercharger is available from IHI for appx $4K... Product # S105... Intercooler is made by Garrett but not available as aftermarket product. You will need to purchase from Mercedes dealer as a replacement for SLK32 AMG...."

I'm not sure if the Garrett package includes the cooler or just the fornt air:water intercooler - I suspect both.
My tacho has red marks after 6000 not 6220.