no i have the same extact exhaust that you do and mine does it too what it is is the way the exhaust flow through the x-pipe if you dont like that then i would got with an h-pipe but dont put cats on your car i like the way it sounds when you hit like 4500 it sounds real rich though if you dont have duel chamber mufflers i would get them cause it eliminates that sound to and its just straight up loud. preffly FLOWMASTER!!!!!!!!!!!!