Eh, I think that's a misconception. A turbo power curve can be determined via the size of the turbo. You can get a smaller turbo and have that thing spool up earlier in the RPM band.

The Vortech is definately made for higher displacement motors. For the money you'll spend regardless, I'd get get the Greddy kit for the R. Only reason I say that is because I believe it's CARB legal... Otherwise I'd say go custom!