I put on my 3.4" SC pulley this week, and love the power increase! Much more responsive from 3000 rpm and up, a slight increase in blower whine with the hole in the roof open. Next mod will be a FWI ( fender well intake ) as soon as I get the parts.
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2004 GS GTP/WS6
3.4" puley, BIG conical K&N filter
14.22@96.5 mph