There is another thread about this.
It seems to be the pad material used in the steel brakes.
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18? Camaro 2SS 1LE
16' M3 MG Ext. /SO Int. (DCT, Ohlin R/T, 19" wheels)
15' Audi S4
13' Audi TTRS (APR stage 1, MSS springs)
09' C6 Z06
08' M3 Interlagos Blue: 6sp, Tech.
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