Join Date: Dec 2005
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I had the same thing on a Megane I owned previously, It was the catalytic converter breaking up.
It sounded just like a rattly heat shield or something metal rattling as you describe.
I'm sure that your local Kwik Fit will put the car up on the ramp and say if this is the problem.
Currently in Chris Brown's garage:
2007 2.0 16v Sport Tourer, Clio GT