MTM have made a Supercharger Package for the Rival of M3 the RS4.We are talking about a Normaly Aspirated V8 wich revs at 8.250 and has a Compresion Ratio of 12.5:1(
http://www.audiworld.com/news/07/mtm.../content.shtml ) .This kit is producing 535 bhp and 580 Nm of torque.Excuse my scepticism but you were talking about Supercharging high Compresion Ratio engines and if it was Possibile to do in a BMW M3 E92 engine V8 with 12:1 Compression Ratio.My vote is that in the next year we will have a couple of aftermarket Kits wich will supercharge the bimmer to somewere between 540-570 bhp at low boost ( 0.4 Bar-6.5 psi).On the other hand maybe not, this is just my guess......