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Pulley is labelled correctly so unless it had the wrong part number put on it, you can eliminate that one. You made a good point, don't eliminate a bad dyno set-up, number fudging etc.
The 6psi kit is the 475HP kit. The stock boost is about 4psi. Also, all of Saleen's HP ratings are at the crank. We have seen an average of 419HP at the rear wheels with the 475 kit.