Strange Rattle from 51 plate S class

[barrieeld]

Im wondering if somone can help i keep getting a strange rattle when i accelerate, i have had an initial inspection and there is no exhaust rattle underneath....could it be the cat?


any suggestions would be appreciated.

If i do have to replace the cat convertor how much am i looking at?

[Parrot of Doom]

Heatshield or cat most likely, but it could also be a loose exhaust bracket.

Get it up on some ramps and get a mate to rev the engine while you explore.

[sneijder]

Cats used to break up on the earlier W220 S Class, lots of speed bumps at home/work ?