You guys have to also remember that Andy puts a lot of R&D in these setups. He isn't just throwing them out there claiming they can do something they really can't. Plus Calvin has put in a lot of R&D. There is a lot of test and tune that has already been done so that you guys can save time and money. If I was a dune or trail rider, I'd be on this.
Cam, send a PM to "23champ" here on BHQ. He is a fellow hillclimber that had a couple of custom cr500 pipes made for his hillclimb bike. They are pretty monster looking pipes. I can't remember off hand who made them but I am sure they can make one for your application.
Shearer makes an inframe DM pipe. It's basically the big bore pipe with the bigger flange and a bigger diameter stinger tube. The way mine are set up is with the bigger flanges and 1 1/8" stingers and no silencers. That's how Cameron at Redline had me set mine up. I actually cut my own flanges off and built my stingers instead of buying a set since I already had BB Shearers. I know that I should probably be running a one off custom pipe for my bike though. I am curious to see how these Snypers work out. Gary told me he already has an inframe DM pipe.