Whats this sreaching sound i hear????

[RicosFinest]

Alright i bought an 04 Sti about a month 1/2 ago and about a week ago it started to make this screaching noise when i build boost...i changed the turbo inlet hose and my air intake, i also change my stock blowoff valve wit a new stock one, i also did a boost leak check and im not loosing any boost i dont know what else to do so can someone help me out here????

[nsvwrx]

Uppipe leak? BPV leak?

[RicosFinest]

I havent checked the uppipe but i did check the BVP so ima try checkin the uppipe and see what happens thanks

[STi-Guy85]

dude i had an 04 STi and it did the same exact thing! Where the down pipe connects to the catback, tighten the bolts/make sure they are tight... thats all it was on my car... a simple fix, but like you, if freaked me out man!