400ex jet size with pipe and K&N????

[futurebuyer]

I recently put on a K&N air filter with a slip-on White Brothers E-series exhaust and i need to know what size jet it needs and anything else that i need to do to it with the additions. Thanks!

[Wheelie]

Remove the airbox lid and install a 40 pilot and a 155 main.

[hotrodhonda400]

i'm running a 165 with slip on, filter and a cam and it runs great.