hey when i drive my gt_z levin up to the high revs theres a real load squelling sound does any1 no what this is from

One of two things
a slipping supercharger belt
supercharger whine

yea man i had that problem it is defently is the belt
you can either tighten up the belt which isnt that hard to do
or
get a new one
i sugest a genuine toyota belt from a toyota shop

DO NOT get a repco one because the are *****y i went through 3 in one month cos if they snap
that same belt is running your water pump and it will over heat