i have a similar noise coming from what seems to be the left rear (driver rear). I thought it was the exhaust, then i changed the it from the oem piece to a magnaflow unit and the sounds persists. it seems to only happen to me when cornering at low speeds(under 20mph) i checked my end links and everything thing seems to be tight. the exhaust hangers are tight i am not sure what it is. but the more and more i listen and hear it I think its the exhaust because everything performs properly.