I have the stock size K&N. Too much oil can cause a host of problems. How often are you cleaning it? They don't need to be cleaned all that often,,depending on how much you drive off- vs. on-road. If you are looking for better performance, I would suggest an upgraded exhaust. I put an NRP exhaust on mine (didn't want the Borla "Harley" sound on the trails) and noticed a HUGE increase in performance,,,and that's running 33's. I would imagine performance on stock vehicle would be huge.
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