2008 Altima Coupe 2.5 Horsepower numbers?

[ESP]

Well...yes, and no.

The stock system is completely closed. The only way to get air into the engine is via the duct in the front. With any WAI for our cars (even the K&N and AEM systems), the cone filter is sucking the air in from all around. Seeing as the inlet for that duct is so bloody skinny, I'm skeptical as to how much air is actually getting to the aftermarket filter...which is why I bailed on getting the K&N after some serious thought...