Nice one Jon, looking forward to seeing the pics mate.

I've sometimes had a similar sound with my coilovers when I go over some speed bumps where I live a little bit too fast.... doesn't happen when I go over them real slow though. So I can only imagine that it's the tyre hitting the arch liner.

You would have to be careful of removing the arch liner though as you could end up where water has been collecting up inside the bodywork and then it would start to rust from the inside out

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Driving my JCW is the best fun I've had with my clothes on!!!!