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So im runnning copper plugs in my 91TT. so far so good, pulling plugs today ..after 3k miles..perfect light ash color to them , no sign of detonation, ect..ect...I know this should be in Tech section, but im pretty happy with these $ 1.99 plugs. Any pros or cons with these plugs by other members let us know!! Ive only been running about 9psi of boost, with split downpipes, fullexhaust, intake, chip , 93octane gas, 0-60 at everyred light in town. I bought these plugs at Advance auto parts and can be bought at autozone as well.
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