I think that's the sound of air back flowing to CAI from BOV.
you know, in the CAI, there isn't any velve to prevent back flow,
so the rest of air which can't get in the inlet back flows.
I have the sound too..lol
I thought I can hear the sound in recirc. mode also but there was no sound at all
I'm thinking that I'm gonna change the setting once I get sick of it.
btw, vta makes her bit rich
Hi, this is my first time posting
Anyway, I got a HKS BOV today and mounted on my MS6.
Here's a question, How did you guys deal with the hose(thick one), when you
set up on VTA mode? did you close or use some other way?