I scrape mine a little weekly, it will make contact a moment before the floorbaord if my suspension is compressing at all.. The contact point is the collection chamber, it can only be seen on the bottom of the heat shield cover.
Have never scraped them. Have scraped my boards. Clamp bolt on the crossover pipe points mostly downward (angled to the rear)...have never had a problem there, either.
First day with the Power Duals and they are all scraped up I thought I was hitting floor boards and I guess not. The day after install I went to recheck the tighening and man was I pissed. there has to be something to do about this. my bike is only lowered in the rear with the Streetglide shocks. If you look at the shields you can see they hit before the boards. not that im always getting that low but there are times when I do. I can only imagine If i had these when I rode the dragon they would have holes in them by the time I was done.
I've scraped my x-pipe heat shield at least once. I also just rode the Dragon and I don't think that I scraped it while I was there. Overall, I like the look and the sound over the dresser duals.
Never scraped or dragged.
Haven't done the Dragon but have been on Needles and Iron Mountain and if it was going to scrape it would scrape there.
I had my EZ up centre stand scrape a few speed bumps till I took it off but the pipes never hit on the same bump.