Quote:
Originally Posted by JoJotheTireMan
That is exactly how mine is setup, hooked to manifold vacuum. Low vacuum equals CAI and high vacuum equals WAI/HAI. A3 (1993-1999) VW 2.0L air box has dual inlets and a vacuum controlled flapper to switch back and forth.
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My 91 Jetta had one of those, but the cold air intake was only 1 inch diameter. I tore that whole thing out and made it a 4 inch diameter feed directly behind the headlight and I actually gained 2 mpg. But it didn't run so well in the winter; stumbled routinely...like I had water in the gas.
[edit] maybe I should have made the flapper bigger instead...