Gotta Go Jdm Big Diff. Ecu Help?

Dropped A New Moto In My Civic Jdm Gsr. Man Its Way Quicker Than My Domestic One. Im Runnin It Off A A Si Ecu. Other Than The Fuel Cut Off Being 7200rpm(si) To 8100rpm(gsr) Am I Loosin Anythin Else?????

It won't control the secondary butterfly for your intake manifold. If I had a GS-R I'd get an aftermarket IM anyways.

O Alright And How About Fuel Output Does That Differ