IAs far as I can tell, virtually nobody has experamented very much with turbo BMW 3.2l S54 engines (E46 M3 and 2002 M Coupe/Roadster). The 11.5:1 CR has been generally percieved as way too high for a turbocharger; until recently. A company named DA-Motorsports is about to release a turbo setup for the S54, at stock compression and 8-10psi. They estimate 550hp.
I am not too up to date on turbo technology, but I always thought that an 11.5:1 CR was way too high for most FI. Here is a link...
http://www.da-motorsport.com/projele...kits/index.htm
My first question is if these numbers are even feasable from the S54.
My second question is if this setup would reduce the reliability of the engine to the point of it breaking down too often for daily use.