Encouragement of street racing first off.....
Anyways... Ill suggest some mods, due to me having a celica... wished I had removed some parts before I sold it but didnt... whatever though.
Single exhaust- TRD... quiet... non-ricey sound, single pipe.
Dual=non-functional. + dual looks/sounds ricey as fuck!!
Put stock bumpers on, just do a minor lip kit... "jdm style" lol
Remove the roof scoop... im sorry you did that to the poor car.
Eibach COIL OVERS all the way... had those on my celica- and now have their springs on my miata, cant go wrong.
GT, or GT-S? Depends on what model you have for the turbo or supercharger.... I honestly would sell the car and just get something new if you're wanting boost it.... all that costs way too much to maintain and do.... I researched all that when I had mine... I would have been paying for something that wouldnt be over 300HP.... several G's.
Newcelica.org for technical questions dude... me and maybe one other person have reasonable celica knowledge on here.... you're wasting your time. SRSLY.