I have a strange noise but not to sure the source it happens a when your on biting point of the clutch and you get the vibration it sounds like its coming from the back of the car maybe exhaust or something seen as it only started a few months back when someone bumper into the back off my I checked exaust all seems fine and on all it's rubbers? Could this be the clutch making the sound? But the car had a clutch around 10 - 15k ago just before I bought it , any suggestions?