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Buried my needle yesterday against a Chrysler 300 hemi and was toying with him. The bike was screaming at 120. No wobble just plain stupid every time I do it but I love it.
Funny you should ask! I never even thought of it helping, but now that you say that it does make me think it kept the front end from "floating" at high speed like I anticipated it would. The spoiler came on the model but HD does sell the spoiler for Dynas.
I have seen the CVO's come with them.
I have seen them for sale and debate about buying one for my Softail.
I have seen larger ones on H-D drag bikes.
I know the drag bikes serve a function. But I wounder how much the smaller factory ones really work.
I buried the needle past 140 a few times, including once while loaded up on the way to Sturgis, with no vibration at all.... but that was on a V-Rod, so I know that doesn't count!