I found the MSD does make a tiny bit of difference to performance on my setup , and should help once i get around to putting in my supercharger.Even for a stock application , it will help , but don't expect a huge improvement thats super noticable.It just makes it run a little smoother , and I found it improved my idle just a tad.

1996 Jeep Grand Cherokee 5.2 with mods.Hughes Air gap intake , 52MM TB , ford injectors, 2 3/4" lift, Doug Thorley headers , HID headlights with LED , HID fog lights , glow gauges , a few others