M104 engines are actually easy for fitting a centrifugal SC. Years ago when I had a C280, I seriously contemplated of SC it. I picked a Powerdyne BD-11a headunit for the project, with 6psi pulley, which I think should be the max boost for the M104 engines due to their 10:1 compression ratio. Powerdyne BD series SC's are ideal for this application, they are internally belt driven, silent, and no oil lines required. I actually sketched and mapped out the dimensions for the brackets, but I sold the car shortly afterwards, so the project was scrapped. Any competent SC or turbo shop should have no problems custom fitting one to your car.
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