Here is the dyno sheet from the before and after with the headers, exhaust and tune. We didn't have the chance to do all the tuning work we wanted to as we had to dyno it with the pulley also. I will wait and post the pulley dyno until after we release some news at Barrett Jackson. Not sure how someone got 430RWHP and tuned to 470RWHP unless they were using a different dyno. Even then does not make sense. I know of four dynoed and all made between 462 and 473. I wish I could say headers and exhaust made 70RWHPhp but I can't
