Maybe I am just a dumbass, but I have just gotten 3" exhaust all the way back with a 3" high flow cat and just a random muffler (magnaflow I believe) in prep for turbo. Is there a reason that my exhaust sounds like shit in higher rpms? (after about 4k) It's deep in low rpms but sounds like crap in higher rpms? Not enough airflow maybe? I don't really want to waste my money on a header that I am going to have to take off and get rid of when I get the turbo. Any help is appreciated.

Andrew