QUOTE(Glock23 @ Aug 16 2008, 10:48 AM)
The hole in the center of the filter. I got it figured out though.
Nothing can be done about the wine I asked 3 people today in the city.
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So Glock23, share with others what you got figured out about the hole...
My guess, it's for Ram Air Induction with a hose fitting that hole.
When I put on my SRI, I took out all pieces of the factory plastic intake, all the way down to behind the bumper. There was a LOT of extra pieces, like resonator boxes, chambers, etc. to de-modulate the intake whine produced by these engines.
Run an aftermarket intake/filter, you're gonna get whine.
But it's only at idle, once on the throttle the intake 'growls'.