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I dont have one, probably not buying one also. So dont know all the facts
I can understand that these filters have a bigger suface, but isnt the flow the problem overhere :
- they are pretty much restricted from the heat shield side
- when you close the trunk they are probably also pretty much restricted from that side
- they are not open on the top side, I have seen cones that are open
- the first cone blocks the way to the second cone, so I dont think this one sees much
fresh air.
But ofcourse I dont have one, so i cant check
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