Would you ever run a marathon breathing out of a small paper bag? So why ask your engine to rev all the way to redline breathing through the restrictive factory airbox? The plastic factory airbox is good at muffling intake noise and enhancing low rpm/low speed engine performance, but becomes very restrictive when the engine is operating in the higher rpm range where most performance drivers need it. The NEUSPEED P-Flo allows you to uncork the intake side of your engine, drawing in a nearly unlimited supply of fresh air. Most applications gain an honest 5-8hp at the wheels in the midrange and higher rpms (depending on the vehicle.) Plus, every P-Flo kit includes a high-performance, multi-layer cotton gauze air filter that is washable and reusable, and traps dirt better than your original paper filter. You also get an aggressive, deep throaty engine roar when you step on the gas pedal.