I just added a mac pro chamber and the new black super 40 series flows to my 04 GT. Does anyone think that the new flows sound quieter then the old delta flows ?? Just doesent seem as loud as others !!
My bro put the super 40s on his 78 nova and yeah they are a little quiter and they don't have as mush of that good ol flowmaster sound. But flowmaster claims they can add 50hp. On what i dont know but thats what they say.