K&N drop in will give you the same result ( sound / air flow ) as an dedicated cold air intake on the N20 with the added advantage that you can always put the stock filter in so you can still use the car while the K&N is drying after you wash it / re-oil.
Only real reason to spend 10 times more money for a CAI is under the hood bling, if you go to car events and this kind of thing matters to you.
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