Well mine got smashed racing, b/c someone hit me. But I def had mine on end w/ the stock grab bar and she didn't get harmed at all.
As for the silicone, when you run it, put a piece of paper around where it meets the adapter and see if it moves from exhaust hitting it, if not, then I wouldn't worry about it. Really, it shouldn't move anyway due to the resistance to flow, but just some food for though. I'd like to see just the slip on actually, and how it sounds over a full one like mine.
2008 700xx; Power Bomb header with power core 4 exhaust, Power Programmer III, pro armor nerfs, prm products control front and rear bumpers and full skid, 10" ITP rears, ITP Baja's fronts, RZR 2's all the way around, Uni filter, 13t sprocket, CCP steering Damper, DS450 shock swap, Dual Gasser Throttle, bar risers and Moose barkBusters. 730XX kit plus other engine mods!