[Biturbos4] detecting air intake leaks

[David Kavanagh]

Has anyone come up with a good "tool" to test for air intake leaks? The 
kind of think I have in mind would be some sort of cap that fits over 
the MAF intake side and contains an air fitting and also clamps on with 
a large hose clamp. I've seen similar things for the '91 20v turbo engine.
If nobody has a parts list, I'll try to put something together.

The reason I'm asking is because one time recently, I heard a sound like 
a small air leak upon hard acceleration. I haven't heard it since, but 
the other day, my wife phoned to say she heard some high pitched sound 
after making a turn (and going up a hill, I think). I haven't been able 
to reproduce, but want to check for leaks in the intake to make sure 
those turbos don't overspin.

David