Performance is good. I may have had a bit better part throttle response with 18-20 degrees of vac adv. coming in around 5in. vac, vice the 12 degrees at 10in vac, but the response I'm getting now is strong, and I have no ping. I may play around with it some more to see what the max I can get is, but due to my location, it is difficult to tune and test on the roads.