Hey guys. I have a 2014 Sti that is basically stock.
I’m having a loud squealing and hissing noise whenever my car goes to boost (3k rpms). Sounds like a loud pig! Noise sounds like is coming from passenger side. I checked for boost and vacuum leaks and replaced the following:
Intercooler couplers
Turbo inlet hose
All clamps
Car acts normal when idling; only weird under boost. Any idea what’s going on?
Could an up pipe be causing problems?
Problems started after I test fitted a cold air intake, took it for a drive, and put the stock back on (I know, it needed a tune).