The flanges are different between the turbo of a sprinter and a om617. That's easy enough to make and fabricate with some welding and cutting to fit.

To decrease turbo lag, you would want a small turbo housing. Larger housing increases lag.

If you want more power, intercool it, larger turbo, exhaust and tune the pump.

The om603 does not have a lot of turbo lag. Something had to be wrong with that car. Mine hauls a$$ for what it is.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k