i remember reading a while ago that the vdi system is ~2# boost when its open, is there any truth to this? anyone ever pressure test this? dont get me wrong im not about to put a boost gauge on my n/a, (lol) im just interested as to pressuse change with 6pi/vdi

 

no its still a vacuum.

 

Yes, I've tested it, it's still a vacuum, whoever said that was lying.

 

The VDI and Aux ports use about 2 psi to open (provided by the air pump on a S5), but there is no boost in the intake system.