Anyway, i compared them to 3's and yes i felt an improvement. There was 4 of us riding this thing and we all came to the same conclusion that they are better than 3's, feel like 2's and are leaps better than the duncans. pulled them out one more time and put them in the wifes stocker(t5's, stock carbs, +4 timing and pods)and holy fuck, bottom end everywhere so im gonna order up a set for that. To the guys running 2's, just keep them. If your running stockers or 3's their worth checking out. That is my review, thanks.