If you buy one, just remove and toss the gimmicky butterflies, and it'll be fine.
Heard the standard Hyper' can be restrictive, maybe the "Pro" is better ?

I have one on a 103 t,cam with crane 310 cams tts tuner & hooker trouble makers & 2005 springer 88 t,cam the only fault is the foam filter on the end.
it requires frequent oiling to stop fine dust from entering, if you leave it until the K & N is dirty, the throttle blade will have oil & grit that between your fingers is like grinding paste.
since i remove & oil the outer every couple of months it has cured this problem.
after 19,000km the old 96 barrels & pistons were showing no signs of scuffing from dirt.

cheers
Yob