i was planning on a stack with a larger filter too, but the space is too confined i have no idea how you're going to get anything to fit in there.
FWIW, I have a 3.5" to 4" silicon adapter to a 4" to 6" stack (ram) that got to a filter on my audi. its great : )
i was hoping to buy another setup like that for the boxster, but there is no way that filter would it in the boxster : (
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