I put my oem airbox back on my Z today the first time Its been on for years, Im moving more towards a oem+ build, I removed a K&N pod that I was never really happy with, its was jammed in behind a front mount. I fitted it after my unifilter intake kit deteriorated and noticed a sharp decrease in throttle response with the K&N pod vs the unifilter. Im assuming because the unifilter was flange out to a funnel that was about 6" filter. Pic for refrence. This bring me to the point of this post, the air filters that are currently fitted are oem that I washed years ago and put in storage, yes oem filters are washable. My question is do K&N/blitz/arc drop in filters offer any performance over OEM?