Here at PerformanceDoctors.com and Advanced Performance, we have chosen to carry only one brand of automotive air filters. We have found that AFE Filters are not only of higher quality, but have many other features not found in other filter manufactures. AFE Filters are washable, reusable high performance air filters. They are designed to Increase horsepower and acceleration, and will not void you US vehicle warranty, and have emission standards which are legal in all 50 US States. Both AFE & N&N Filters have a outstanding 10 Year / Million Mile Limited Warranty.

We believe the primary function of an air filter is to deliver both high airflow and superior dirt protection. These air filters provide minimum restriction allowing high airflow into an engine. In the vast majority of cases increased airflow will increase engine performance measured by horsepower and throttle response (torque). The performance benefits of maximum airflow are clear, compelling and well documented. That is why so many professional racers are willing to run expensive vehicles with no air filter, as opposed to installing a disposable air filter. They are seeking the additional horsepower and throttle response needed to win the race. These air filters are designed to provide superior filtration of the contaminants that can harm your engine while maximizing the airflow characteristics of the filter in question. Because no two air filters are alike, the specific airflow and overall filtration efficiency will vary depending on the filter in question. However, you can rest assured that each air filter we sell, has been designed to achieve high air flow while providing superior filtration. Both air flow and dirt protection are critical to engine performance. For this reason a consumer should always evaluate an air filter based on both its filtration efficiency and air flow capabilities.

Air flow is so important because at its most basic level, an engine is an air pump. More air entering the engine increases the efficiency of the combustion process creating more horsepower and torque. Horsepower is a measure of the engine's maximum power while torque measures how quickly you can accelerate. They are designed to increase engine performance in both horsepower and throttle response by reducing air flow restriction. Maintaining optimal, unrestricted air flow becomes a problem when it must pass through a filtering medium. The level of air resistance varies depending on the size, surface area and physical attributes of the filtering medium. This cotton air filter design flows substantially more air throughout the filter's life while maintaining filtration levels critical to ensure long engine life. On average, a square inch of our filter medium will flow at least 50% more air than a square inch of paper or synthetic filter media.

We are here to provide you with quality high performance products at prices you can afford with the service you expect.