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But Mad North-Northwest
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The main difference I've seen in the AAV's is a different cutout shape in the moving shutter. This affects the airflow vs. warmup curve.

In practice I doubt it makes very much difference which one you use provided it closes when warm and you've got the warm idle set right via the bypass nut.
 

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Discussion Starter #3
When I tried to google a picture of it I didn't realize there are a few that the air in take side are on the bottom. I guess it would be in from the valve cover or some strange mounting point.
 
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