turbo back exhaust $800
generic intercooler kit $450
cai set up $300?!
bosch/walbro fuel pump $250
SAFCII/S-ITC $500
DBA slotted rotors $400
GCG Hiflow/2nd hnd HKS turbo (low mount, ie GT2535) $1500
turbo timer $100
EBC $400
Thats $4700, then add tuning on top of that, $2-300 maybe?!
thats a quick list, hope it helps.