[NiftySVX]

The stock air filter is capable of flowing more air than the throttle bodies. Any modification where the air box is removed will result in a decrease in horsepower due to a loss in volumetric efficiency. Also, air filters which contain oils are dangerous and cause damage to mass air flow meters. I throw K&N air filters in the trash about once a month and put a stock filter back in for a customer who has destroyed their MAF from the inferior filtration.