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OEM Intake manifolds will usually sacrifice peak horsepower, in favor of greater average power and increased gas mileage. OEM air intake systems also incorporate noise suppresion devices and non-optimal air intake routing which can hurt performance.
Adding a AEM cold air intake to an otherwise factory intake system can add anywhere from 5 to 20 horsepower, and improve gas mileage. The best part is, companies like AEM sell C.A.R.B. exempt cold air intake kits, so your car remains street legal.