Vauxhall Astra Mk6 GTC 2.0 TD (165 BHP) – Years of manufacture 2011 on. EBC rotors have passed this test and in the case of the Turbo Grooved design, the brakes were shown to run 100 degrees F cooler than non slotted rotors proving their long made claims that EBC Turbo Grooved Discs run COOLER!