I just picked up an 05 STi and it was running fine. I went to install an accessport and now the vehicle has a hard time accelerating but will build boost. It almost feel as if i were hitting the rev limiter. Could i be that the vehicle has a grimm speed boost control and the tune it is currently running is just a stage 1 tune ? Check engine light will come on as well as flashing cruise control. The code it is throwing is that it is running rich. Should i try to throw a stock boost control on or just go get a pro tune ?