Hi, I apologize in advance cause Im most likley posting this in the wrong place. Anyways, im experiencing boost fluctuations in third fourth and fifth gear in my 2002 WRX. Iv done some research and im leaning more towards a vacuum/boost leak. Im seein if anyone can help me do a boost leak test? Iv already tested my bcs and it checks out good. Other than the fluctuation the car runs champion. I really appritiate any help.
Aloha

 

Try finding a smoke tester first then if u dont find any leaks from that then look up online for a boost leak test tool u can make your self and have a air compresser

 

I tighted my turbo inlet hose and the intercooler hose conection which were both very loose and no more bost fluctuation. Hope this help someone in the future.
Aloha