Mpowered, my buddy has a Frankenstien E30 M3 that he has made custom exhaust and headers, welded the e36 M3 diff and suspension. That car is a rocket. He has pulled the interior, put a cage and racing seats, removed the AC. Are you planning to do the work yourself or a shop? I could put you in touch with him.
The other guy with the turbo on his E36 M3 had the dealership install the turbo about 5 or 6 years ago. I don't know if Dinan sells the turbo anymore. As for cost, not sure about that, maybe $4-6000for the turbo and maybe $2-3000 for the labor and tuning.