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Old 10-11-2004, 06:38 AM
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There is some truth to this, and that is, a stock engine or one modified, either way, stock exhaust changed to true duals with straight pipes, no other changes, the valves get cooked, due to the mixture being too lean, any time that back pressure is reduced, the mixture must be richened to compensate, since back pressure was reduced the engine can now pull in more air/fuel and when it`s not richened more air is added but fuel is not, hence it being too lean which results in excessive cylinder heat and the exhaust valves get burned or a piston gets hollowed.
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