You need to know all about the K&N Cold Air Intake | Readylift Leveling Kit | Magnaflow Exhaust, starting with the cold air intake, which is an aftermarket product popular with many vehicle owners as a method of drawing cool air into an vehicle's engine. Cold air intakes claim that the product increases engine efficiency as well as its performance. The theory behind the claim is that colder air has a higher density, which means a higher amount of beneficial oxygen.Such systems can be manufactured from a wide variety of materials, including plastic, rubber, metal, or a mix of composite materials such as fiberglass. Many believe that investing in an intake made with the best materials is well worth the money spent. Most systems, if installed correctly, can result in a rather size-able horsepower increase.K&N air intakes are very popular and most are street legal in all states in the nation, and most are even approved by CARB, California's Air Resource Board, as environmentally safe. These systems are put through many specific tests and are made to meet most state's emission...