I would consider the OEM enclosures sealed not ported. That hole in the enclosure vents into an enclosed space and my feeling is that what they are really doing is just enlarging the enclosure. The hole is big enough in comparison to the total volume of the box for it not to act as a port but rather as a pass through to a larger air space.
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2016 Porsche Cayman GTS - Sapphire Blue / Black Full Leather Interior / Carrera S Wheels
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