I appreciate everyone's contribution to this thread, with special thanks to Speedtek!
I am in the SLOW process of adding an intercooled single turbo to a 1990 300SL (129) with the M104 engine.
I though I would post urls to a couple of pictures of the exhaust manifold in the late stages of fabrication. I have since finished the fabrication but have not yet pressure tested and sent out for ceramic coating.
http://www.concentric.net/~whitcomw/images/SL/PIC00005.JPG
http://www.concentric.net/~whitcomw/images/SL/PIC00012.JPG
The turbo details: The compressor housing A/R is T04E series turbo (50) with a number 11 compressor wheel (Garrett P/N 442476-0011). Measurements on the compressor wheel: OD = 2.2", ID = 2.99", height = 1.5". The turbine housing is a T3 with .48 A/R, narrow base, open throat. The turbine shaft is a T3, slope ground to high performance specs. It has a water cooled center section and has an integral waste gate. Purchased from 'theturbohouse' via ebay.
I will post more as I make more progress. My questions are what is best for fuel enrichment and ignition timing control when using CIS-E.