A test was recently run comparing the horsepower and torque of a SVT 2012 Mustang GT using an OEM paper filter and a K & N filter. The results? The paper filter (when new) outperformed the K & N. Dyno runs: Stock Filter 381.8HP 372.2TQ 375.1HP 371.9TQ 376.1HP 369.3TQ K&N Filter 377.2HP 368.5TQ 373.0HP 363.7TQ 368.0HP 361.7TQ Read the entire comparison test here: SVTPerformance 2012 GT : K&N Replacement Filter Test - SVTPerformance
That kind of put all of K&N's talk of being a better filter on the shelf. Especially when everyone knows their ads say that they add HP.