EBC DP41920R 04-08 Porsche Boxster (Cast Iron Rotors only) 2.7 Yellowstuff Rear Brake PadsEBC DP41920R 04 08 Porsche Boxster (Cast Iron Rotors only) 2. 7 Yellowstuff Rear Brake Pads Product Information The EBC YellowStuff compound is essentially a race pad but with a big difference in that it works from cold and can be safely used on the highway. If you want the ultimate in high friction braking this is the pad to choose. Brakes feel superb from first touch of the pedal and stay effective up to race temperatures. EBC YellowStuff is