I recently have been exploring ways to clean up the top of the motor and I tried putting a breather filter on a much shorter hose coming from the IAC, Once it was on there, I started up the car, and there was a strange whistle coming from the breather filter. All I want to do is get rid of the oil hose over the top of the motor, which I have a catch can for, and get rid of that ugly IAC hose. I have already seen one Supra with that hose just pulled from the IAC. All mods are in my sig block if any of those make a difference.