weird clunking noise from the rear of my 25td

Hi guys. Looking for some advice. Basically iv had my 25td for a few months and thanks to these forums I've been gradually modding! Cleaned intake system. Induction kit. De cat. Performance back box lowered etc! I've been getting a weird thumping sound from the rear of the car for a while. Thought it was maybe an exhaust hanger but all secure!!! I'm at my wits end with the clunking! Any advice would be greatly appreciated!

Also looking for a set of Sdi's if any1 has any for sale???



Many thanks.

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