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Racing Brake BBK
Racing Brake has a group buy list for their BBK conversion using the standard 135i calipers. With their piston upgrade kit, Hawk track pads, you will get 95% or better performance of other BBK upgrade kits, at 1/3 the price! The shipping will also be cheaper to Australia. Here is the link:
http://forums.racingbrake.com/showthread.php?p=4244#post4244
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