I don't have a CAI (yet ) and under any sort of throttle more than none I hear a hissing coming from the front of the car. Any idea what this could be? Everything is completely stock right now as far as mechanicals.
Sound just like air rushing into the throttle body and down the intake track to me. Do you notice it when you're driving, or at idle, with the hood up?
Yeah, I've got the same thing happening and I've got a 70mm TB with CAI...I guess when I grab a new plenum I'll get the 75..hopefully that'll be part of my feb mod budget