Hey, does anyone know what is up with Volvo's exhaust system. I always pull up behind volvo's at stop lights and notice that some have two mufflers, one on each side of the rear end. The strange thing is that there is no exhaust tip on the lefthand side. The right has a indent in the bumper, and the tip comming out there. The left has the indent but instead of a tip they put a cap to fill the indent, and you can see the muffler under the bumper. Whats the point of the left muffler?