Yes - I have supercharged my s2 and reprogrammed the Motronic maps. I also have a knock counter installed to monitor knock. Even running premium unleaded (and using an intercooler) there is a need to pull timing in the upper rev ranges.
Cool. Is the knock counter through obd or is it a stand alone unit? Reason I ask is mechanical noise can be difficult to distinguish from true knock at high rpm. A lot of noise is generated from timing chains, valve train etc. On my MS2 car, we wired a Bosch 3 wire knock sensor to output a 3.5MM jack and recorded the raw output while on the dyno. The trained human ear can more easily distinguish true detonation or preignition and normal operational noise.