Although RP-X is not R90 homologated for use on the public roads in EU member states, the fact this material possesses excellent cold performance means RP-X can be safely used for driving to/from motorsport events (where local laws permit). EBC Racing does however emphasise that RP-X has been developed for peak on-track performance, meaning higher levels of brake dust and brake noise should be expected. Compared to EBC Racings other track material RP-1, RP-X has a 25 percent increase in friction coefficient across its working temperature range with a much more positive initial bite. EBC Racings 2 pc fully floating brake discs are engineered from the finest materials without compromise, resulting in one of the highest quality 2 piece brake discs available on todays marketplace. These discs are equally at home on the road or at the race track. Outer friction rings are cast from high-carbon G3500 disc alloy, giving excellent wear properties and crack resistance even after heavy on-track use. EBCs patented stainless steel SD-Drive bobbins allow the braking ring to float freely and independently of the centre bell, reducing stresses and eliminating the chance of warping, whilst each bobbin location features an anti-rattle clip for totally silent operation. All discs feature 48 curved vanes and are handed to each side of the car allowing effective heat dissipation. EBC 2 piece discs often offer a weight saving over OEM parts, helping to reduce rotational unsprung mass that has a positive effect on driving dynamics. Additionally, when the disc eventually becomes worn, the hub can be retained replacing only the outer friction ring which reduces long term operating costs.