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Well I got mine done with the Timind adjuster and the exhaust so I cant speak for the pullies alone but after all mine was done all I could say is DAMN!!! Awsome improvement.
is the 98 cobra supercharged? If so I think he's talking about the s/c pulley since running underdrive pulleys on a supercharged engine is going to significantly lower your boost.
usually when someone asks about the performance of "PULLIES" in a plural sense they are speaking of underdrives because a S/C only has one pullY. Thats why.