I have a 400ex with a K&N air filer. I will be putting an exhaust on soon-Should I get WB e series or fmf megamax 2 and should i get just a pipe of a full system? The 400ex I bought used came with a jet kit which I have not gotten yet. I am not sure exactly what jetting requires. Also, what size jets should should be used? I want the power to increase throung the entire powerband. Thanks

 

if it came with a jet kit that should work fine. let me save you some time and some money(kind of). i have 2 ex's one with a slip on, and one with a DMC double barrel. let me tell you there is a major difference. the DMC pulls a lot harder and wheelies easier in higher gears. if you want to spend over 500 get the Curtis Sparks or a DMC. definately!