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I have the K&N Filter drop in but I can't speak for any of the actual cold air intakes. From everything I have read, the filter drop in does little if anything. In some cases I have read a clean stock filter has better performance than the clean K&N filter but when both filters have been in the car a while and are dirty, the K&N performs better than the stock one. I think it would also depend on if your going for more look or actual performance. The Dinan one is expensive but looks the best but I think the ECIS has some of the best power gains but its kinda ugly looking. Just my $0.02 worth.
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