there is a magazine article somewhere that took a bird and dydo'd it, then had the BB kit installed and dyno'd it again then detailed the results. I can't recall the difference but i think it may have been 87 HP with the BB just not sure. I may have it at home and if i do i'll post back tonite. However, there is one thing i do recall, as it was an eye opener.....at 5500 RPM's there was a big jump in power difference between the 1600 and 1700. I don't remember what HP the 1600 was and what HP the 1700 was at that point, but i do remember there was a big difference there, something like 20 HP. i think it had tors on it both as a 1600 and 1700 too, but again i will have to see if i can find the article.