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That doesn't sound good my friend. That is not the intermittent clack many folks here have....that is totally rpm dependant and sounds like it is in the valve train. Did they check your springs during the rebuild? It sounds similar to a broken valve spring....but i have never heard it in an s65 so take that with a grain of salt. I wouldn't drive the car if I were you.
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2013 c63 Amg coupe p31, v7 tune, plm headers, armytrix downpipes, EflexFuel
2008 dct coupe, evolve engine/dct tune, ttp, ms intake, megan exhaust, cf ds. Sold.
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