racing part for trail bike: ttr125?

[john ken]

i have a 03 ttr125, i just wanted to know some racing parts i can put in the ttr125, i wanted to put racing part in the ttr125 because im gonna give it to my friend, he like my cr125, he always ask me if he can ride it, but i said no, so i feel sorry for him, i told him i give him my ttr125 but first i should put some racing part for it so is more fun, he doesnt have a dirtbike