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I have the stage 1 on my 103" build with stage II cams and the A/C still sucks plenty of air.The teks all told me to hold on to it until ,if ever, I upgrade even higher. But to answer your question, based on what i know, If your running a stage one on a stock bike then you would be blowing money for nothing at all.
It is unlikely you will see of feel a difference between the two air filters. It is mainly a looks thing although they have named them stage one and stage two.
Thanks guys. I wasn't sure if the stage 2 was made for motorcycles with a stage 2 cams and engine work or if it was just supposed to be a stage 2 air cleaner. Doesn't seem worth the money to me.
I have the stage two air cleaner, got it cheap from an indy that was closing his doors. I have no up grades to the motor. Breathes better, only thing I don't like about it that it is sooooo damn big, pushes my knee out a little with the round air cover off a Crossbones. Which is another thing, its a pain in the *** to find a cover that fits that giant filter.