Not using an EFR I've gone GTX2867R gen2 ..and since my mates just done 360 on an ib5 and that's had some right pain ..im pretty sure the one I'm going to have built using Quaife or black line will do the job on 300 mate ..im just wanting to know if the ratio sounds right for the car it's come out of ..because if that the case then it will be a good choice for my Europe trip giving these stats on ratio "A" sat cruising just under 3k ..nice fuel economy.