i am running the ebc yellow pads on my front with drilled and grooved discs and i have to say the first couple of uses of the brake pedal they are not very good but after that they are ok.but have to say that they are really hard wearing on my discs. i have had the pads on my car 2 months and i already need to change my shiney worn discs. i am going to put solid discs on this week but if they start to go the same way i will be taking the yellow pads off and putting the ebc red pads on i think