While doing my research on my next coilover setup I discovered this.
"KW equips BMW M3 GTS
BMW strengthens its M3 and broaden its portfolio with a BMW M3 GTS. The 450 horsepower strong BMW M3 GTS, made for the usage on the road and the race track, will be optimized for the usage on the race track regarding the drive system and suspension technology and will be produced individually only per orders. M-GmbH focused only on KW suspensions, that means, that all GTS-models will be delivered with a KW Clubsport suspension kit in series with separately adjustable compression and rebound damping."
After reading through many posts, I though Sachs was the supplier even though the GTS suspension is identical to the KW CS. Now I am a bit happier I ordered the KW CS kit.
Looks like RLDZHAO had it right back in 2010