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Old 11-07-2020, 07:43 PM   #1
valerka6234
Scooby Newbie
 
Member#: 349565
Join Date: Mar 2013
Default Power Loss / Boost Leak? / Up Pipe? / Loud Squealing

Hey guys. I have a 2014 Sti that is basically stock.

Iím 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 whatís 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).
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