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I've used both JRZ RS Pro & Ground Control.. Obviously JRZ wins haha BUT Ground Control does quite a good job. I have a set with just 2 track days on it and about 400 miles (from and to the track). If anyone's interested shoot me a PM.
Z4M Race setup. Red shocks, Race camber plates, Race rear shock mounts, 600/660 springs, Thrust bearings for the front, nylon spring cones for the back, bump stops, OEM BMW rear shock dust boots (put them on myself as they aren't included.
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