PTRider
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A stock-type HiFlo air filter is about $15 available (probably by special order) at most non-Suzuki shops...and at Suzuki shops if you insist that they get it for you. I think they are high quality. I'm not a K&N fan, and I don't think they do anything good for an engine except eliminate the need to buy replacement filters. Instead, you get the messy job of cleaning (and waiting for it to dry) and re-oiling the filter.* Between Suzuki, HiFlo, and K&N, I choose HiFlo.
Changing the length and/or diameter of the intake will change the power characteristics of the engine. It might be better, or it might make things worse. Try your changes and see what you like. Usually shorter and bigger diameter helps top end power and hurts low and mid range power...only if done right. A change to the intake might require a jetting change.
*Yes, I've owned K&N and foam air filters for cars & trucks, felt zero difference in performance, had a dirty downstream side of the air box with the K&N, and had the dubious pleasure of cleaning and re-oiling them.
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