I bought it from bilstein.kr and type is bilstein BTC. Yes, when I make the decision to change the suspension include shock and spring, I did a lot of research also include bilstein.com, I have not found the coilover which is suitable for genesis sedan, the coilover from my understand it just produce from SMA, megan before.
I found
http://genesisclub.or.kr from korean, this website have a lot of information we could refer but it need translate korean from google chrom .
www.naver.com it's another useful website have a lot of information we could refer.
the shock is tuned by bilstein.kr and they tell me the core is made from Germany, maybe they did some tuned from bilstein B6 in order to suitable for sedan.
The feeling:
I got the big improvement from control and handling, I found fun for drive myself and the car has more stable compare with my 2011 genesis sedan, my shock part number is 3m701, myabe the 2012 is 3m801 and they have 3m802 and 3m901 for the shock, about the sock number pls refer my previous reply .
First I did another change to replace my original tires from Hankook H426 to Continental CPC2, a lot of small scrap vibration reduce. I recommend replace tires is the first setp who are not satisfied with their ride, it's less damage and you will find the different, but I'm not satisfied because I found that sit down into a Cone, becuase left and right roll still can feeling into the body even though it is less disturb.
Second I replace the shock and spring with Bilstein BTC, it could made me turn the corner faster(amazing me but not my first requirement), it tame the car calm down special for
steering wheel, previous car have a lot of out of control feedback from steering I don't like, now it's become more stable and made me ease, the sock doesn't feeling thin. The steering feeling like drive a BENZ. I will try to throw it into highway later for taste the different, I will reply more if got your encourage for my poor english, thanks everyone who give me the help and information.
I found the same effect as below vedio:
http://v.youku.com/v_show/id_XMTkwMjMwMzc2.html