JayKay,
I have not seen exactly what you are explaining, but I do understand the concept and yes, anything you can do to seal the aftermarket "cone filter" setups to the outside of the car.. is GOOD!!
Muffler: Porsche has installed a resonator chamber/muffler to decrease (or control) the sound of the intake on the Boxster's/Caymans. They accomplished this by a "pimple" hanging off the intake tube, on the 2005-08 cars this "pimple" was part of the air box right where it makes its transition to the throttle body.
I'll show you with a picture..
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