450rrider025

wats up guys...i have a 450r but just picked up an 04 banshee thats mint and completly stock except for fmf pipes and tires that i just bought. I love the power of this thing but as most people do, i want more. Im not really good with 2strokes so my question to you guys would be..what motor mods should i go with to make this thing quicker...i want the thing to rip but i also have a price range..somewer around $500...so what do u guys think i should go with? thanks for the help