Did mine today at 911 Zentrum. Custom assembled by the owner of 911 Zentrum himself. Cost RM250. Got them to do the installation as well. Installation wasn't cheap tho, RM100, but IMHO worth it. Did a splendid job.
Performance wise, immediately noticeable. More feel to the brakes and seemed to bite better too. Strongly recommended. Its a must do for people with a heavy right foot.
Explored with owner about group buy.
Min numbers is 10 sets. Prices are from RM260 upwards, before discount.
Discount is pretty good. Requests that Committee contact him officially to work out the terms and conditions, time, etc.
Prices for installation I saw were:
Installation for 4 hose set up is RM100
Installation for 6 hose set up is RM130
FYI, the owner used to race Porches and has two shells sitting in his garage workshop area. Also had a few customer 911s, including a RUF 911, a 944 and a 928. The owner now drives a Ferarri.
Other stuff there also included go-karts and related equipment, stuff from OMP, Brisk spark plugs and Weicher strut bars.
FYI