I haven't. But Chris E on the GG FaceBook page has.
Here's his take:
" Well the verdict is in. It works better than it looks. Power is boosted from bottom to top. It seemed to smooth out power delivery. It was definitely money well spent.
A couple things I noticed. Jetting was too lean and I had to go up one size on the main. The bike is noticeably louder, it just has a different tone and more of a ?bark? to it."
" One other thing I noticed. The compression has been bumped up considerably. The starter struggles a little until the battery is warmed up."
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