This topic has been discussed many times in the past.
http://www.bmwclubmalaysia.com/forums/showthread.php?44071-msport-absorber-replacement&
http://www.bmwclubmalaysia.com/forums/showthread.php?49031-Which-absorber-brand-should-i-choose&
http://www.bmwclubmalaysia.com/forums/showthread.php?34083-Whichone-is-better-BOGE-or-SACHS
http://www.bmwclubmalaysia.com/foru...ension-for-E46&p=732448&viewfull=1#post732448
Like what bro consoglieri has mentioned, it is almost impossible to obtain the original BMW M-Sport absorbers here. Even OEM M-Sports replacement which are Sachs Advantage and Boge Turbo is pretty hard to come by, unless you import them directly yourself like what bro haywire did for his E39 or speak to ZF Malaysia and request them to order for you. They cost about RM4.4k the last I asked last year.
Your available options are below (to be matched with your original M-Sport springs):
Non-sports (OEM) setup:
Boge Automatic: approx. RM1.2k (BA or any BMW parts stockist. Widely available)
Bilstein B4 (black): approx. RM970 (First Division)
Sports (aftermarket) setup:
Bilstein B6 (yellow): approx. RM2.1k (Auto Future)
Bilstein B8 (yellow): approx. RM2.6k (Auto Future)
Bilstein B12 (B8 + Eibach progressive springs): approx. RM3.6k (Auto Future)
Koni Yellow (Damping adjustable): approx. RM2.6k (Hakomoto, with installation)
Titan (Custom-made /w height & damping fully tuneable per request): approx. RM2.7k (MPD Auto, with installation)
Depending on your preference, we have forummers here on various setups that gives them the same or even better feel than the stock M-Sports setup.