Zex spark plugs
#2
TECH Fanatic
iTrader: (361)
Had the same question a while back.
https://ls1tech.com/forums/generation-iii-external-engine/412405-new-zex-plugs-anyone-using-them-good-bad.html
maybe this will help, had mixed reviews
https://ls1tech.com/forums/generation-iii-external-engine/412405-new-zex-plugs-anyone-using-them-good-bad.html
maybe this will help, had mixed reviews