What's the easiest, most cheapest way of increasing the engine's horsepower? No, it's not by cutting your suspensions springs. Neither is it through getting a loud muffler, though that might help. The first step in increasing the power production of your car's engine is deleting the stock air intake housing and replacing it with a cold air intake (CAI) system. No idea what a CAI system is? Simply put, it's an intake system that feeds cool air into your car's engine. Cooler air carries more oxygen molecules. And that lets your car's engine create more power. K&N knows this, and that's why they came up with the perfect filter to use in a CAI system. So how does cool air make the engine more powerful? Here's a little lesson. Your car's engine measures and mixes air and fuel for proper combustion. Since cool, dense air carries more oxygen, the engine then mixes in more fuel atoms to obtain the proper mix. So what happens is you're actually packing in more air and fuel to burn into each combustion cycle. That's how the engine creates more power. And that's where K&N plays a major role. A CAI system is designed to suck in huge amounts of air to feed into the engine, and for that, you'll need a high performance filter that'll still trap impurities in air. That's why most CAI manufacturers use a K&N brand filter. This can all be explained by the underlying principle that an engine is just like a big air pump. The freer air flows in and out of it, the more efficient it runs and the more power it creates. There is no better explanation. So if you want more power from your car's engine, improve its intake air flow. Hook up with a K&N filter. Visit Car Stuff today and see all K&N parts available.