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If they are the copper NGKs, they do not last as long. Could be as little as several thousand miles before the gap opens a bit. Eventually, you may get misfires. Having changed the plugs on my S65, I can say it is not a job I would like to do every few thousand miles. I do run NGK copper racing plugs on my turbo 99M3. Plugs won't make any power unless the ones you have are deficient in some way. If you are misfiring or detonating, you are probably getting codes that would give you some idea.
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