[Technick]

Brian you are right every bit of H.P. counts, BUT, I seriously doubt that you would feel or even see a E.T. improvement with just the 5-7 H.P. difference. You will HEAR the difference, but in reality you would not see a bit of difference at the track. 5-7 H.P. just does not show up at the track in a 3,400 lb car. Now if the cats are removed in addition to other mods at the same time then the story is different. In a lighter car it is possible to MAYBE see a difference, like a 2,500 lb car it might show up. On average in a late model Mustang (94-up) it takes at least a 15 H.P. difference to show even a .010 drop in E.T. Thats 1 hundredth of a sec.! To drop a tenth you are looking at something even more dramatic. And of course the faster the car the bigger the improvement HAS to be to show up. So I guess if you have a 20 sec car 5-7 H.P. would show an improvement. But on a stock 13.8 sec Mustang you are really splitting hairs to even get that one hundredth of a sec. improvement. It will SOUND like 1/2 a sec improvement, but that is all. I am not bashing the idea of removing the cats even though it is against Federal Law to do so. It all adds up in the long run and you have to start someplace, I am just pointing out that on average it just does not make much improvement if that is all you ever do. If done in conjunction with other things, then yes it can be a more significant change.