as long as the chip is burnt for the 650s, and 48psi fuel.. you shoud be fine.. just make sure you have a good Cat! Your ECM should adjust to where it likes it anyway in closed loop. Cant remember what my WB was saying at 2500 rpms idle..

11.45@125,
stock bottom end 6bolt 2g head.
272 hks cams.
Holset hx35
Backyard biult!!