In general, 5 HP at best for cone filter on naturally aspirated motors (any motor)... in cold weather. In hot weather, your performance may actually suffer... most noticeably the first couple seconds from a standing start. Heat soak. If you must use a cone filter, make a heat shield that, in effect, creates an air box around the filter to minimize heat soak.
An internal combustion motor is basically a constant displacement air pump. It can only pump/draw in as much air as it can displace. A cone filter and a different intake pipe may ease some intake restriction to help the motor breath easier. But, look at the stock airbox and intake tube... pretty obvious it doesn't need much improvement. The intake path is fairly straight with only two bends. One at the TB and one at the elbow. Use of an intake kit would be pretty much be for cosmetic reasons only. No huge benefit in performance gain. If it ain't broke, leave it alone.
Once you add a supercharger, it's a whole new game.
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