I'm just buying a warrior and i would like to know wich mods to buy in order to turn the warrior more faster and powerfull. Please post your opinion.

i would first get a fmf performance max2 silencer!!!k&n high flow air filter, racing cam to make it faster i have:80 over wisceo piston,racing cam,durablue axle,lonestar carrier,holeshots on top of 190 full bead lock rims,renthal chain and sprockets, ac alloy nerfs, renthal handlebars,motion pro twist throttle,works front and back suspension,ct-racing a-arms, lonestar swingarm, maier racing fenders front and rear, ceet ceat cover,ac front mud screen bumper and rear six pack rack, shock wears,motion pro kill switch,woods gas tank,

damn man!! will that keep up with a 400EX?!?

Ok but i don't want to spend a lot of money. Which are the most needed?

Start out with air induction and exhaust. K&N air filter with Dynojet Stage 1 kit for the intake and a White Brothers E-series exhaust will help quite a bit, and are necessary for any further mods as money permits. Then either punch some holes in the airbox lid or get a vented lid from White Brothers. If you've got stock tires on it (Dunlops), try to get rid of them as quickly as possible. Maxxis Razr's (or Holeshots) improve the handling drastically, especially at higher speeds.