K&N intakes are known to add an average of 15 to 25 horsepower compared to a standard system. Each kit is rigorously tested to ensure that the filter and intake pipe are positioned to maximize airflow and power. Jason Fenske from Engineering Explained put this to the test, and the results were impressive. The Crosstrek produced 164.3 hp and 142.5 lb-ft of torque with the K&N air filter installed.
This was 1.1 hp and 1.71 lb-ft more than the cheap aftermarket filter, proving that K&N filters do indeed deliver more horsepower. The aftermarket CarQuest filter was also surprisingly effective, producing better results than the clean OEM filter despite its lower cost. The air intake pipe is made of high-density polyethylene (HDPE), a black plastic material. Fenske also tested acceleration times between the four candidates, and the K&N filter came out on top.
I've used K&N filters on most of my cars and trucks, and I can attest to their effectiveness. I also removed the screen before the air cleaner box and reset the computer by removing the positive cable for 5 minutes so that it could relearn the new air-fuel mixture. Fuel consumption was not affected by the K&N filter unless I had a lead foot most of the time. In conclusion, K&N filters do indeed produce more power than standard air filters, as proven by Jason Fenske's tests. They are also easy to install and maintain, making them a great choice for anyone looking to increase their vehicle's performance.
