OK, they came in. Packaged very well, and weighing in at 22 lbs.
The first thing I ran into was that the pipe at the flange was a tad bit bigger than stock, and the snap ring wouldn't seat in the flange bracket. Just took a bit of grinding on the snap ring to get it to fit.
Next after a half hour of trying to get the nuts on, I had to remove the rear heat shield to get my fingers in there.
Everything else fit great, the rear bracket bolted straight to the frame, no adaptor.
The little wire that hooks to the butterfly inside, is made to set it in one position and leave it. So if for some reason you had to reset it out on the road somewhere, you';; be laying on the ground cussing it. Knowing me, by riding season, I'll figure out a way to adjust it while riding down the road.
Hopefully I can take it for a ride tomorrow, but I did fire it up. OMG Very deep tone, loud, but not ear hurting loud. This is with the butterfly open, I'll wait till I can ride to play with it.