A couple of months ago my Jag ( 20 mod. XE Dynamic S ) started to get a progressive worse vibration noise from my exhaust, got the car put up on the ramps ( at my local tyre dealer ) and found it to be a rubber bush with a steel liner on a setup of two pins at horizontal opposites ( not connected to anything ) that were welded on at the front of the back box. I duly took the car to the local Jag dealer and they fitted a new rubber bush ( only necessary on the one side, on driving it home the car was vibrating a bit so I called the dealer and said the vibration was worse, I was told to bring it back in ( 3 weeks between appointments ), they reset the exhaust system hangers but again on driving home the vibration was still there, this time they collected my car and gave me a loan car (delivered to my house as I was fed up driving the 18 odd miles to them ), they said they would contact the factory for advice, the advice they got was to remove the ( dampeners ?) completely as new one's were not now fitted to new Xe models. I got it back after 4 days then a couple of weeks later I got a call from the dealer to see if I was happy with the repair, I replied that there was an occasional ripple vibration that went through the car but being fed up with all bother I would just live with it.