I've been running 3" UNI filters with the needles on notch 4. Back when I did those first runs I was on the stock airboxes but the "fur" filters were disintegrated. Stock sprockets(for now)... hence the 8400Rpm for 123Mph. I just can't seem to decide what gearing I want....
I should get a new chain before next season so that kinda makes me want to go ahead and switch to a 520 with an 18/30 combo since I cruise with my brother at 95Mph for hours.... but my front 17T is in perfect shape and a 30T.... or 31T and a new chain would be less of a sacrifice of in town fun.