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If you still are basically stock, AKA - still have stock manifolds, go with stock plat. plugs. Only becuase they are such a pain to change, you want plugs that will last a long time.
If you're looking for performance and don't mind changing the plugs ( I'd guess 2-years, 40K ), then I would go with NGK TR55s ( .40 gap ).
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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