I got my Calmini header installed today. I was going to attach it to my original cat, but due to the way the original down pipe/cat setup was on my Tracker, I had to bypass it :-/ Anyways, driving it was interesting. I seem to have a little more power. Not a ton, but noticable. One thing that stands out now is smoothness. For some reason, the trucklet seems to accelerate and shift smoother than before. Anyone else notice this when they added a header?