Hi I just install BMC air filter and a complete racing termignoni exhaust... And now I have a question... Can I just drive my bike normally without power commander and a remap? When I have a test ride I hear when a bike was still cold a little backfire in the airbox... But when is on the running temperature everything is OK...
No need for a PC, remap is a good idea.
The S2R800 runs very lean (=hot) stock. This becomes quite a bit worse with your mods. +1 for a remap. Or a PCIII if you want.