Since im pretty new at this I do not know what porting matching the exhaust means could you please clarify?And do you mean chronically over reving the engine like up past 4k all the time and stuff or more near 5&6k.Does the water pump turn slower with the UR pulleys?or did you mean over reving all the time would cause over heating and such?
With any underdrive pulleys the other components turns slower, like the water pump...
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