if you are leaving youre cats in place dynomax will sound great,if not on the gen ones very loud without quality, if you go with borla with cats,in my opinion dont waist youre money other than higher RPM wont make that much of a difference,if you like a little more aggressive go with dynomax 16",will sound great with cats,we have installed countless systems and prefer the bullets,every Viper that leaves here with them on love them,we give the option if it is to loud or customer not happy with sound we change them out free of charge,i think we did it once,wife made him,6 months later wife left,bullets back,i hope this helps.....Scott