EVOLVEU

iTrader: (16)

Ok, well I have about 37k on my 03 evo and have every bolt on imaginable(alky, intake, tbe, etc...) and yesterday for the first time I hear this air sucking noise from my engine bay. It only happens when I am in vacuum(at least thats when its noticeable) and once I get into boost, I cant hear it anymore. I thought it was the xfer case, but I am not sure what exactly the sound a bad xfer case makes. My next guess would be a blown/loose coupler. Id check now, but I am at work. Anyone have ANY ideas before I get into it? Thanks in advance!

19psi

iTrader: (6)

hmm...I get this sound too.
I was just assuming it's normal since I have a tbe.

I"ve checked all the clamps and they are on tight.

Let me know if you find out what it is.

Smike

iTrader: (8)

At idle is the DV opening to let air back into the intake. Under boost - thats the turbo. Do you have an open element filter? I know you know the difference. Check the turbo inlet clamp too (the post MAF to inlet one).

TCs make a loud whining noise all the time when they are going/gone.

EVOLVEU

iTrader: (16)

It almost sounds like a leak, but I havent really looked yet. I will be off work tomorrow so Ill find out in the morning. Its not the filter, lol.

Ev0ikon

iTrader: (18)

leak. Find and plug it

EVOLVEU

iTrader: (16)

hahaha, I hope so!