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After a dyno tune a clunking sound became noticeable and is now not annoyance but a concern as the car is scheduled for a track day Sat. My C4 has clinking sounds and the axle u joints were replaced to resolve that issue. The C5 sounds a bit more chunkier than the C4 clinking. Seems the sounds are reduced under slight acceleration. Any of you drivers or technicians have any thoughts. Thanks.