Right i have a stage 3 esc cos and am running the denso plugs which are running fine. I have some 071's which run lumpy at idle, i rang EA and he recommends champions 59 c's i rang SCC they recommend champion 57c's. I dont wish to use the denso anymore as i have heard rumours they aint that great. Someone on here said the 59's will have bad idling and i thought the 57's were for cars with more bhp??????? So why is it running fine with one set and crap on another???