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Some motorsport tuner on german ebay I think.
Forgot his name.
With non m z4 you get highly modified e-brake shoes (I assume just like I did mine)
I don't know if the ad is still there.
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Z4 3.0i | ESS TS2+ supercharger | Quaife ATB LSD | Brembo/BMW performance BBK front/rear | Schrick FI cams | Schmiedmann headers+cats | Powerflex/strongflex PU bushings | Vibra-technics engine mounts | H&R anti rollbars | KW V3 coilovers/KW camber plates | Sachs race engineering clutch | tons of custom sh#t
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