High-performance air filters can offer a noticeable increase in power, typically ranging from 3 to 5 HP. This may not seem like much, but it can make a huge difference in the overall performance of the vehicle and the driving experience. To test this, a K&N filter was installed and the engine produced 164.42 hp and 142.53 pound-feet of torque. This was the best-performing filter, but it only generated 1.1 hp and 1.71 more pound-feet than the cheap aftermarket filter.
On the other hand, the OEM air filter allowed the car to produce 158.25 hp and 137.25 lb-ft of torque. I installed a K&N filter in my van and removed the screen in front of the air filter box. I also disconnected the positive cable for 5 minutes so that the computer could restart and relearn the new air-fuel mixture. Surprisingly, the aftermarket CarQuest filter worked better than the original clean filter, despite costing less.
K&N filters are designed to retain more dirt and particles per square inch of material than regular paper filters. This is because paper filters have to have extremely small openings in order to effectively filter, which slows down airflow. K&N filters also increase airflow by up to 50% compared to traditional disposable paper air filters, as they don't have excessive baffles or components that slow down air flow. In addition, K&N intakes protect the engine by using a specially designed, high-quality, high-flow air filter.
As dust accumulates on the surface of the disposable filter and blocks openings in the medium, it will normally restrict air flow more and more over time. A paper filter has a principle called surface charge, since dust accumulates only on the surface of the filter medium. Finally, you can keep more than 100,000 miles on one of these Audi filters and use the appropriate K&N refill system to clean and grease the filter. This way you can continue to get the performance you expect from your K&N air filter while also relying on its efficiency and cutting-edge protection.