To be honest, I'm not sure that this is an option that they offer to just anyone. At the time I ordered these custom-built D/A's, I got the impression that they were doing it for me 'cos I've had so many sets of TCK coilovers before.
1st set - initial version of TCK coilovers for Z4M (Koni yellows) in 2006 - clunked badly due to design
2nd set - revision in 2007 - a lot quieter but still clunked
3rd set - the kit was sent to Koni Holland to be rebuilt at the end of 2007 and no more clunks. But this took about 8 months. A few people also had their kits rebuilt by Koni Holland that explains why theirs don't clunk. I sold my kit to mfanatic325
4th set - decided I still liked TCK better than my GC. Ordered another new set of TCK in 2012, and it still clunked like the 2nd set I had. I returned them.
5th set - TCK custom-built this current kit in-house for me. No clunks.
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2019 Porsche 911 4 GTS
2016 BMW M3
2008 BMW Z4M coupe
Last edited by GP20; 12-15-2012 at 03:19 PM..
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