300ex jetting

[ABM-Cannibal]

I got a stock 300ex w/cobra jet full exhaust and want to know if I need to rejet or wait till I get a K&N air filter and buy a jet kit?
I also want to modify the airbox.

[Out_Sider]

well, i would put the stock exhaust on over a cobra any day.... but i guess u could just rejet now, and get about a 130 main for it, then when u get the k&N and stuff, u will have plenty of jet to handle it all