Mine was great. We switched from an off the shelf 1050 Dominator (on a well used and scienced out 528 motor), to a Pro Systems dom that was built for my new (at the time) 572. I think it was rated around 1200cfm, I can't remember. Anyway, we also swapped out the manifold (440-3) to a 440-3X (again for the 572) and picked up 2 10th's. We ran it for the rest of the season, after a little tweaking, it ran a best of 10.003 @ 137 compared to the 10.3?? (it's previous best). So a solid 3 10th's overall. Pretty sure this was about 12 - 13 years ago.