Jetting!!!

[jsmit]

Im really confused about what jet sizes i need to go with. I have an 07 gs500f and have a drop in k&n air filter with stock exhaust. The elevation where i live is 500ft. Im planning on getting a yoshimura trs slip-on at some point. I have read the different posts about jetting but still dont know what sizes to go with. Im assuming i can go ahead and jet it before i get the exhaust. Thanks for the help. 

[The Buddha]

K&N and stock exhaust I would do 20, 65 mid or #3 washer, and 132.5 mains. I'll put a kit for you for $28.
Cool.
Buddha.