Horsepower Loss Minus the MSD

How much of a difference will taking my 6AL box off make? And significant HP loss? I wouldn't expect a big loss, I'm just curious. I haven't driven my Stang long enough to realize any difference since I took it off. I'm putt'n around on my GSXR mostly right now, I don't trust my car to drive it much for long since I found all these probs with it. Thanks!