What should i do?

[Bullrider21]

I have pretty much a basic 400ex 05 model (K&N, White Brot. E, and jetted) most of my buddies can walk away from me what should i start out doing to my bike to keep up or should i just go all in on a 440 kit?

[ImWhite]

what r they riding?gearing will help,and any motor mods such as bore,cam,piston and so on will of course help u out

[Fast350ex]

Go all ballz and get the Curtis Sparks 465 pure power kit and blow them all away. That is of course if you have about $3,500 ready to dish out and wait about 6 months.

Anyways, (Sparks pipe, K&N filter, Hot cams stg. 3 cam, wiseco 416 11:1 piston, 14 and 38 sprockets, and a little rejetting and you will be good to go.