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try a search on this man...I made a post on pulleys a few mths back...definately noticed gains all over the rpm range...Good for close to 10 rwhp, for the money you cant beat it.
Lets say you do gain 10rwhp, and go off TSP's pricing (with new belts and bolts), it comes to $240. That's $24/hp. Terrible value for money IMO. Since we are being generous, a ported stock TB could new you 5rwhp for $50...$10/hp. Thats well worth the money, and youll feel the quicker throttle response as well.