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usually a after market cone filter is about 3" diameter where it meets the intake pipping....what this really basically is .is just an adapter to put a 6ish inch filter thing.....(not sure if im explaining it correctly) and besides it making the interring bigger it has a rounder edge which they say it smoothens out the air so it can get in the faster and smoother.....thats how i would explain it....i think thats how it works
