Really speaking, an Eaton M90 is to big for a 2 litre engine.
They can't operate efficiently at a particularly high pressure ratio and turning 1 slow enough to keep it within it's usable pressure ratio on a 2 litre will result in slower than ideal boost curve.
"Better to spin a smaller (positive displacement) supercharger faster than spin a larger supercharger slower." This will give you your desired peek boost pressure lower in the rev range, giving a broader torque curve.
The above quote came from a guy who builds supercharger kits (and wrote a book about superchargers, mainly for Alfa's) for Alfa Romeo's and he uses an Eaton/Magnuson MP62 on standard 2.5 and 3 litre V6 Alfa engines and managed to get (an American) 200RWKW from an internally standard (9.5:1 CR) Alfa 3 litre V6.
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