Unfortunately I didn't monitor it on the datascanner. I do have an LT4 KM, but I don't think it would have made as much power as it did if I were seeing any knock.

http://users.compuzone.net/dsmturboawd/stockdyno.jpg

Kinda odd, but with the cutout opened, it ran richer, and picked up a good 10 HP and 10 ft/lbs peak, and there were gains everywhere. Didn't think of it, but some of the gain may have been just from running a bit richer. Hmmm... time to play with it some more.