Well I installed my Racing Beat exhaust today. Did it by myself, so it definitely didn't take 1.5 hours, more like half a day! I do agree with the OP about the location of the clamp, you really have to squeeze in there to tighten things up. And the instructions seem to say to tighten to about 25 ft lbs, but it looked like the nut was eating into the metal.
Installation was fairly straightforward, the only puzzle was whether or not to push the tailpipe all the way in into the muffler section, since doing that was distorting the tailpipe rubberhanger inward a bit, but to me the more metal there is overlapping, the better it is, so I left the rubber hanger distorted a bit. I also sprayed some spray-on copper gasket sealant on the connectors and flanges, just as insurance against leaks.
Exhaust sounds great, my goal was go get rid of the off-throttle drone, and it's mission accomplished, while having a nice deep exhaust note. I do get a clunk while going over some bigger bumps, probably will have to do some small readjustments, but overall this is a great exhaust.