feels slightly more torquey pulling away from a stop. other than that no real change other than better sound. i had a decel popping issue in the slow jet circuit on cylinders 1 and 3 that i've never been able to squash. before i left for a 60 or so mile ride i turned those two back out from about 3/8s to 3/4 from closed. if i listened really close and there wasn't a bunch of traffic around me i could hear a really quiet dull pop or two every now and then decelerating under 4000 rpm. barely noticeable. maybe the diffusers added some back pressure? sounds great accelerating.
