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other guys much smarter than me on this forum.....but my porsche go to it guy here in town (cdn motorsport hall of fame...and certified mechanic) says stay stock filter -cheaper less fuss and simply "drill the hell" out of your stock airbox....other comments: cup pipe (primary delete) worthwhile for power to the crank (maybe not to the wheels!!) but mostly lightens the rear end and enhancement from a chip debateable (altho on this forum most users of a steve wong chip report positively).....