I can confirm this is an issue. I just picked up my 2009 RZR with the rear bumper and the exhaust does point straight at crossbar. Only see a few ways to fix this.

1) Redesign rear bumper
2) Provide a slip on tip to angle exhaust away from crossbar
3) Replace with aftermarket exhaust

The sound once you get going is not bad, but at idle and slow speeds it is much louder.