What size is the small vacuum tubing ID?

[badger.]

Searched a lot, couldn't find an answer. What size is all that vacuum tubing that goes around the intake manifold? Is it 3.5mm or 4mm?

Thanks

[jakeoboy67]

are you talking about the SAI vacuum hose that goes from the front of the manifold to the 2 combi-valves at the back of the cylinder heads ?

[badger.]

yea

[jakeoboy67]

yea

got my whole SAI system at home in a cardboard box lol ,
I'll measure the tubing ID on friday if you can't find it.

[SlickFix]

3.5mm, I believe. At least that's what it is on the A4.

[924Carrera]

On the installation guide for their valley pan gasket and check valve kit, ECS Tuning notes to be cautious with those lines as they are brittle and links to some vacuum hose to patch with in case they do break. It's 3.5mm ID contitech hose, so I'm guessing that is in fact the size.

[badger.]

Thanks guyz :)

Gonna be tearing into the PCV and all that, figure I should be prepared since it is so brittle. I'll buy 3.5mm.