I'm hoping someone else has experienced this and can enlighten me. When I hit bumps, even small ones, at low to medium speed (50 km/hr or 30 mph), there is a metallic rattle in the rear end of the car. It doesn't seem to matter which side of the car the bump is on. I'm driving a 2011 CXL with about 145,000 km (approx. 90,000 miles) on it. It has been up on the hoist, but the mechanic didn't find anything loose in the exhaust or the sway bar links. Any ideas?