Cut outs?

Around here in Lubbock, the thing evry Ls1 owner seems to do is get a cut out at teh Y-pipe. I have ridden in a WS6 with said cut out before and after he uncapped it and there was a very noticeable SOTP difference. It felt a good bit quicker. Now this may be in my head cuz with an open cut out and LTs and no cats, that thing was like instawood already. But I want to get LTs this winter and if I have some cut outs made for me would it be worth it? I have never seen them on a Stang so is it even possible? I found a muffla shawp that will do em fer 120$. What do you guys think?Any help greatly appreciated. Dont flame me for liking an Ls1-esque mod but I want to make a lil mo' powa.