Yes it does stop it leaking if you do the bolt mod, I removed the SAI because the ribbed pipe that connects to it cracked and VW wanted something like £16 a section x 2 or 3 sections 
I also use a CAI so didnt need to run the pipe into the Airbox
typical VW wanting £s for something that probably costs them pennies.
I have just recently fitted a CAI, the pipercross Venom that I bought off someone else on here. they gave me a small foam filter too which I placed on the end of the SAI. Is that correct. My cold air feed goes behind the headlight, but I notice some people stick theirs down the hole by the battery to go behind the bumper, but I couldn't in any way fit my pipe down there!
when I get round to it I'll do some pics 
cool, that will be interesting to see them
Bavs replaces all the standard tubing which is prone to breaking down and splitting with silicone tubing where as the link I posted removes the N249 and N112 and the hardlines are replaced with 2 sections of silicone tubing, one from the plenum to the DV and one from the plenum to the FPR
In short if it can go, on mine it goes 
I think I will just try Bav's for the moment, until I get more confident at knowing what I am doing.
Although it probably won't be too long before I take your view and strip out all that goes LOL
