W/ stock exhaust:
Dellorto 15.15 SHA
stock airbox = 58ish
"performance" filter = 62ish
Those are gonna vary a bit from bike to bike but thats a good place to start.
From what i hear, dont waste yer money on the sim chrome. Its how much, 70-80 bucks? Just save that and put it up towards getting a G3 or leovince from quarterkick or the like. Or, shit, thats enough $ to get a varioplus variator from treats next time he has em. To me the sim chrome just seems like a waste of time and $.
For my "performance" filter i messed around with pantyhose, and screen window repar mesh. It does make a difference. Good luck