I'm looking for a newer bike and i definitely want to upgrade to fuel injection.

01+ f4i's are injected...thus the 'i' designation. the only diff from the f4 to f4i is from the head up. (and of course wiring harness/ecu)

theoreticlly, the only things you would need to swap an f4 to an f4i are: head(includingt/b's and fuel rail),wiring harness, and ecu. not sure...but you might need the i's fuel pump.

ok thanks for the info really appreciate it :D