exhausts made for gts only (veilside, tananbe, trial) fit gt as well. as for supercharger, i know trial is coming out with one, TRD
has a prototype on their car and i do not know if it will ever go into production, being the fact that it doesnt fit under the Hood
. Turbo, there is david drapers, and stafford fabrications, ive heard good things about srafford fabrications.