Girodisc Raybestos ST43 Race Pads for BMW F8X 370mm RearBMW F8X M3 & M4 with blue calipers BMW F87 M2 with blue calipers Raybestos ST 43 are our favorite intermediate track pad. Very aggressive pad, yet easy on the rotors. They are down slightly on overall friction and initial bite from the most aggressive offerings, with the flipside being lower running temps and increased component life. Make no mistake, these pads are the real deal. We have customers running them in Ferrari Challenge cars, Evo's, STi's,