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Pick yourself up two K&N drop-in air filters. You can't go wrong with them.
 

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I recommend using using OEM from Nissan otherwise MAF sensors MIGHT have some minor problems because of the oil on K&N filters, but I have the K&N cone filter on my Mustang and the car did sound a little louder and i had no problem. Maybe cone shaped is different than flat.
There is a lot of write ups online about this you should check them out

K&N filter Vs OEM
 
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