1st thing

[GreenBuds420]

hey whats the 1st thing i should put on my 400ex to make it faster k&n filter and jet kit?

[mx400]

slip-on w/ filter and kit is a good start. then go ahead and get the header. then start with other little stuff till you feel like you need more power. thats when you tear into the good stuff.

[PIMP]

to make it faster an exhaust will work...