hi to all, i have a mac catback w/ 3.5"tips. the drone is incredible throughout the powerband. mostly from 35-65. i need suggestions on what mufflers or x pipes to use to get rid of the resonance this exhaust produces. i'd like to keep my tips as they are the chrome ones that go all the way to axle. the low rpm sound of this exhaust is real nice, any suggestions, i've listened to mustangexhaust.com, i need more opinions. thanks...see my sig for mods if they affect the drone.