Better to be safe than sorry. You technically don't need gauges or a custom tune or upgraded plugs. Does it make it safer to have em? Absolutely.
Makes me feel a lot better when I'm smashin the gas pedal also.. Peace of mind goes a looong way.
Besides plugs aren't that expensive. At this stage of the game no need to skimp out on that part. U should have extra coin lying around for emergency situations anyways.
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