So this is my first HD and first fuel injected bike. Should I buy a KN filter replacement or just save up for an entire air box kit? Not thrilled with the idea of the open element style because of all the rain here in South Korea. Or am I just being paranoid? Will get to exhaust sometime this winter. Was not planing on getting a tuner till then and what's the way to go there? Seen little fuel guys all the way up to 500$ Dynojet tuners? Thanks!!