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- '13 CWP MS3 & '16 Mazda6 GT
buy the spark plug non foulers from autozone (cant remember the part number, its here some where) and drill out one of them w/ a half inch drill bit then but that one into the non drilled one and that goes into the o2 bung and then you just put the o2 sensor into the non fouler.
been running like that for a few years now
been running like that for a few years now

whats this trick exactly? I may need it if I do my exhaust....