I had a mild hissing sound at idle, but it got removed when I did a SAI block off.
Hey everyone whats going on ??? today i went out side to warm up my car before heading out to work ... When i started my car i got out and i hear a Loud HISSING sound ??? So i popped the hood and it just got louder ?? sounds like its coming from the top of the motor and also on the left side by the belts ??? its a 2004 R32 and i just hit 80K miles?? anyone have this problem or know what it could be ?? Thank you