for my next upgrade i am thinking about a sti turbo. i want to start taking step by step before i hit my goal for 300 whp+. i am thinking about buying a stock sti turbo which i believe is called the vf-39. i was wondering how much can i look to get on my wrx with a CP. i am also wondering can i go to a stage 3 with that turbo? since it is an upgraded turbo from the wrx Thanks in advance.