chargercalvin
04-09-2009, 07:11 AM
i have a 99 300ex. it has a fmf megamax pipe (with end cap on) and a k&n air filter. i just got it so i dont know if it has a jet kit. it runs kind of crappy. it backfires alot and the throttle response isnt great. also it takes a while to idol down. i changed the plug and cleaned out the carb and it didnt help. i guess its time for a carb rebuild. i figure i should go ahead and jet it. what size jet should i get?