EBC Racing 22-23 Subaru WRX RP-X Racing Front Brake PadsEBC Racing does however emphasize that RP X has been developed for peak on track performance, meaning higher levels of brake dust and brake noise should be expected. RP X has comparable disc wear to many other popular track race materials; however, RP X disc wear is considerably greater than EBC Racing's other track pad RP 1 which results in high levels of brake dust. Compared to RP 1, RP X has a 25% increase in friction coefficient across its working