2004 mustang gt with 73000 miles a bama tuner SR performance CAI and glass packs... It's a dd what's the best brand of plug to get for mpg and performance and also what cops should I get its time to replace them
04GT,It cant hurt. But if they aint broke, dont fix them. oem cops will outlast any other cop that i know of. As for sparkplugs, get either ngk tr6s or autolite 103s.