So if you have filters on each of the carbs and not the stock air box, the carbs need to be rejetted? If so I'm thinking the po of my bike didn't know what they were doing and messed up a good portion of everything I'm going to need to get it up and running again.I have K&N pods on my 600 and it runs fine. You will have to rejet the carbs to achieve the correct results. Depending what jet kit you use will determine the size jets.