I'm running the BMC drop-in filter. I've read you get better flow initially, but after some time it flows no better than the OE filter. I don't know if this is true. It can be cleaned and re-oiled and theoretically will outlast the car.
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I still wave at Boxsters, but they no longer wave back :-(
2002 Boxster S "Violet" (sold but not forgotten)
2009 Carrera 4S "Kelsey" (current ride)
2015 FIAT 500e "Nikki" my commuter car