i have recently bought a 2005 wrx with engine problems and a blown tranny for a winter project car and have a few questions. The owner did an sti swap in it so it has an sti engine but did not upgrade other things such as wiring harness and transmission. not sure if i can rebuild the engine yet until i find the time to take it apart. my questions are if i have to buy new motor and transmission should i rebuild as wrx or as sti? also wondering on price difference. Also want to know if i do an sti swap what else i would have to upgrade other than wiring harness. if anyone can answer my questions it would be appreciated.

Thank you,