hey i was thinking of getting a fmf powercore 4 exhaust.Does it need to be rejetted if i get the full system or slip on? thanks

 

i just bought a powercore 4 full system with a kn filter. it made a huge improvement in power and starting. i rejetted with a 130 main and a 40 pilot (stock 122 main and a 38 pilot) the change in pilot jet help it start better i can start it now with no choke.