Yah! It's a good thing. I've had a chance to mention it to some savvy race car builders and they say it's very common to get more power/performance out of a car that is freshly built after a few hundred mile shake out. Man, it's easy to get these guys talking. A few liked to mention how even their factory stock performance cars gradually increased in performance as they got some miles on them. My Uncle was a foreman at GM through the late 60's and early 70's and got a new 'hot car' every year. He said his cars always ran harder and faster before he turned them in at 20K then they did new. So this is common and can be expected and enjoyed by all.