in my opinion:
stage 1 didn't do squat for me on the butt dyno. when i put the bdj's exhaust on, i burned second gear for a little longer during a quick shift, and could chirp third. when i put stage 1 on after that...didn't feel a difference in performance. the only thing was the P0336 code and it eliminating my no cat code. im thinking '03's feel the difference. but it's a good mod nonetheless. eliminates codes, helps out the mods.
i just installed stage 2 without toys today...and the difference was night and day. i really really need some motor mounts now