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So are NGK fine Iridium plugs as good as denso iridium motorcraft/autolight or whatever? Basically are these good enough for full bolt-on NA application?
no matter what you get just dont get the 4 ground strap plugs like the bosch +4's... they do not work well in a mustang at all. i just run some copper ngk v-powers in my car and they run great. nothing special.
I run NGK T56s in my car and its an excellent plug. I like mines. I heard a lot of good reviews on E3s as being a good plug and also some horro stories about plug cracking.
Throw some NGK TR6's in there. Gap'em at .050" for N/A and call it a day. I never had a problem with those plugs. They are basic copper plugs. You just need to replace them every 15-20kmi, but for $1.39 a plug you cannot go wrong. I would steer clear from those iridiums especially with multiple bolt-ons. Those are used from the manufacturer for cleaner emissions and 100kmi service intervals. They sound fancy and come with that fancy cost, but are not better than copper plugs