Don't know if you have seen this but I posted this link two years ago. It is a guy who put a Rotrex on a Mercedes 6 cylinder engine.

M104 Supercharger Project Complete - PeachParts Mercedes ShopForum

Here is the link to the pictures including the Dyno sheet:

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Some important info on the dyno run:

I've added a Water/methanol injection kit and jumped the boost up to 0.7 Bar. The Water injection is a Hugh help and money well spent.

And finally Dyno numbers.... 323.7 rwhp and 273.5 ft/lbs. Figure 20% loss though the 4 speed auto and the power at the crank is 404 hp. This is more power than I set out to get so I'm pleased and I'm done (for now).
Link to Dyno sheet:

The spike at 4400 rpm is just a function of trying to get the automatic tranny in the proper gear (3rd) for the dyno. Everything up to 4400 rpm was at 40-50% throttle. It wasn't until thrid gear that I opened it up. Therefore power numbers under 4400 rpm show up a lot lower than they actually are due to the half throttle. With a stick the slope of the curve of the power curve wouldn't have the stairstep look... you'd just drop it into 3rd and open it up.

Trany is a 4 speed auto... no issues yet with 178,000 miles on the clock and over 400 hp though the shaft... a testiment to a fine orginal design! If it lets go some day I won't hold it at fault.... it's done a lot more than it was orginally asked to do.