even if you had mods run the stock ngk's nothing else(or the oe style denso's)
i'm running a 450 hp capable turbo on my 4g63, and i run stock plugs.
just a heat range colder for me and a tighter gap
replace cap and rotor?
How about your o2 sensors?
have any exhaust leaks? i'll bet you do here or there.
how about intake leaks?
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