The stock Nissan air filters are made of cheap paper material and should not be oiled. Also the stock Nissan air filters are restrictive and will flow less cfm of air through them. A high performance air filter is less restrictive will actually add some power to your vehicle just depends on what high performance air filter you choose to install. I seen that the K&N high performance air filters and Green high performance air filters will actually add power to a vehicle.
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