Hi,
I've just had a k04-001 installed on my AGU.
Noticed that there's a slight whine on low boost. And when I say low I mean when the boost gauge comes off vacuum to 0-4psi. The whine is quiet and you'd never hear it with the radio on.
As the car isn't mapped yet I haven't let boost build up any higher as I have n75 disconnected.
But I have on occasion plugged it in to see if it whines on slightly higher boost. It either disappears or is not noticeable.
Anything to worry about? Thanks