Ok I know this is blasphemy, and im sure im gonna catch some crap for this but I want some quiet/mellow mufflers for the bracket car im putting together. 600ish HP SBC on alcohol. Im really liking the Borla Turbo XL mufflers. This isn't a max effort/heads up type car so if I lose a few hp im not gonna sweat it. I hate LOUD and I like to be able to hear if there is any engine or drive train noise. Only problem is Borla's website is very vague on the specifics of these such as cfm. Ive googled them until im blue in the face. Anybody have any experience and or opinions of these? I'll be running the 3 inch pipe size of course. Thanks in advance.