I have a 2011 Forester non turbo with dual mufflers. The tips on both mufflers are not centered in the bumper openings anymore. They are both very close to the outside edges of the opening and the slightest bump makes them rattle against the bumper. I do have the accessory Subaru exhaust tips which I installed when the car was new and they originally had plenty of clearance. I was going to take them off but the bolt heads that hold them on broke when I tried to remove them. All of the exhaust hangers are intact. I finally took a long pipe, stuck it in the exhaust tip and was able to bend them back towards the center and get more clearance. That took care of the rattle. The car has 75000 miles on it with the original exhaust. As crazy as it sounds is it possible the Y pipe connected to the mufflers could spread?