i remember a long time ago when i forst got my N13 pulsar i changed to a k&n panel filter, and to be honest, it didnt make a shit of a difference... i would say its due to the fact that you are still running it in the standard airbox which is restrictive in that its designed to reduce noise. It may have a cold air pickup, but it is a compromise due to NVH requirements of a stock vehicle.
I then ripped out the stock resonator and cold air feed, cut a larger hole in the bottom and put in a 4inch cold air feed tied to the front bumper grill, that was a bit better.. but i saw the biggest difference when i swapped to a pod.
Panels i think personally are a compromise for people who want perhaps a little better breathability but still keep the car quiet, and save money over 300,000kms over buying a stock filter




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