There are different filters installed inside your Infiniti FX45. But the purpose is one and the same, which is to trap dirt particles and harmful elements that can damage vital parts of your car. The air filter helps your engine achieve more power by creating a cleaner environment that facilitates internal combustion process. The K&N Air Filter is a popular replacement choice of car owners and repair mechanics. They put their faith on K&N’s 30 years of experience in terms of filtration system design. What are the advantages of having a K&N Air Filter K33332229? First is its filter design which consists of 4-6 layers of oil lubricated pleated cotton gauze. For a secure and tight fit, the filter medium is placed between a pair of aluminum wire mesh sheets. Second is its ability to trap in more dirt that does not clog when the amount of filth increases. Third is that you can use it for longer period. You can wash and reuse them again after 50,000 miles. If you calculate that, it can last for the same phase as your car’s life. Since you do not have to frequently change the filter, you save money and contribute to a safer environment. The K&N air filter can be used on 2003-2006 Infiniti FX45 models for maximum engine power and fuel conservation. We have a wide selection of automotive brands and parts that include K&N air filters. You can drop your purchase orders on our online store or talk to our customer service representative via our toll-free hotline.