Jake, I have the HoHP. As well as an fmf gnarly, and of course OEM. As I'm sure you know, jetting can change much of these characteristics. The OEM pipe is definately more well rounded. The Gnarly will give more bottom end and I believe is more durable. It's lasted the longest. The HoHP is sweet looking. Gives more over-rev but has a little less bottom. This could be due to the silencer more than anything. It looks like a 4t silencer. It's big ID makes it fairly loud. The HoHP has more ground clearance but it sticks out the sides a little further than the other two. Unfortunately for me this tends to be where I receive the most damage from dumping the bike in rocks.
From my experience in crushing pipes. I don't notice a difference in performance unless I kink the pipe at the first bend off the spigot. It will still run pretty good but a lot of times the pipe will leak at the spigot. Which makes a mess and you can smell exhaust in the slow stuff. Usually the power will just move around the rev range depending on how bad the dent or kink is.
Pacific Crest will repair any pipe for $60. Not sure how shipping would work out for you.
For most of my riding I'm at the bottom of the rev range in technical rocky stuff so I kind of like the fmf. Making more power here isn't really as important as the the occasional trip to the sand dunes, then I'll use the HoHP. Where the noise isn't an issue and I want more over-rev.
So that's my experience!
