Renntech and Kleemann are the well known ones for Mecedes tweaks wit superchargers.. they should both have all the mappings for the SLK32 on hand - email them directly and see what kind of price you can work out for an ECU flash.

Let us know how much you can get the whold upgrade down too.. so far Kleenmann $9500.00 plus installation. If the parts are cheap enough I may be in luck due to a friend that races and has a shop

-marc