i have true dual flowmaster 40 series run to the bumper and dumped, and don't like the sound. i want something that is deeper so i have decided to switch to magnaflow. what would be better sound wise and performance wise? a dual in/ single out magnaflow.... or run tru duals single in/ single out? i really need some info. cuz i'm makin the swap by friday and i can't make up my mind. thanks for any help you can give me.