need some help

[alexp315]

alright i just got a 2003 400ex. im saving up money to get a pipe,jet kit, air filter and a rev box. i heard from a few people there is a few other things that i can do to make it rip. i ride woods often but then again i also ride the roads alot which are wide open so ive got it in 5th to the bar quite a bit. so far it seems pretty torquey but i need more top end. so if any one has any suggestions to what pipe i should go with, what rev box and what filter and jet kit system id really appreciate it. and if they have any other suggestions for quick easy or some what cheap mods i could do that would be awesome as well. please keep in mind im only 15 so im on a budget some what
thanks very much for taking the time to read my post

[firefighterjosh]

If your not wanting to spend alot of money I would buy a HMF Slip on, Foam filter and some jets. ( I like UNI and No Toil) then save money.