It’s all perception, like people washing the car and thinking it then runs better. Its in their heads, that bike would have to have a different carburetor to get any real noticeable increase in power, there was a person that claimed 20hp and that with a cone filter as well as a performance muffler and jetting, the cone filter was eventually removed? That being he put the air box back on because the fuel to air mixture with the CV carburetor and cone filter did not work well together. Perhaps he got it up there in hp sitting still but when ridding on the street and with very different air flow that did not last.

If the bike could be modified for the amount of money people are spending they would not meet the EPA conformity requirements, its actually a dollar amount in the law, the cost it would take is based on more then what can easily be done. Unfortunately those that do these modification only create more pollution and not any real improvement in power. The cost of real and actual modification that would improve performance are much higher then team cheapo would be willing to pay, but unfortunately they do it anyway.