My 02 LTC has a straight exhaust pipe that sticks out on the curb side. We live on a dusty road, so if I drive too fast, the rig kicks it up, but not from the exhaust. If you have a curved outlet, you might try loosening it up and turning it so that it doesn't face downward.
2002 Tradewinds LTC Founders Ed
2004 Tundra Double Cab toad, 2007 Honda Goldwing