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If you advance the timing on the car, you increase combustion chamber temperature, and can melt a plug. That knocking and pinging is not good at all for the car, and you may create more headaces than you want. It may hurt the engine internally, resulting in a teardown and repair. Go with a better flowing exhaust, better intake filter, install a light-weight flywheel and an underdrive pulley set. Although these may add up to a few bucks, they won't cost half as much as an engine overhaul.
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