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Had a similar problem on my Box, "clunking" sound when driving over speed humps or rough roads.
It seemed to get worse as the weather warmed up, with this in mind i began to wonder if the bushes were simply "Drying" out, so i tried a quick fix before stripping any suspension parts.
Quick fix was to warm up some bearing grease, fill syringe and "inject" the grease into any and all moving parts with a rubber shield, ie ball joints etc.
This cured all noise and has been quite ever since.
Carried out this procedure about 18 mths ago, still quite, Box just passed MOT (uk's government obligatory road worthy test) with absolutely no problems.
Must be worth a go as it cost's nothing and in my case cured what was a really annoying, no to mention embarrassing, noisy ride .
2001 boxster
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