I wouldnt worry about it sounding bad, Ive never heard a truck with stacks sound bad. It semas to give them all awsome tone, almost like putting a flowmaster on a gas truck. Both our trucks are stacked and I've probably installed atleast 10 stacks kits and they all turn out sounding great.
This is how we do it in New Mexico Here she is boys and girls!!!!!!! Equiped with Edge with attitute, Airaid intake, 4" turbo back Monster exhaust, duel fuel lines to feed the hungry beast, 6" Rancho lift, 35" BFs new mud terrains and oh ya for all of you payin almost 5 bucks for your uncle Bushies over priced diesel....she runs on 100% home brewed:stir: biodiesel....oh ya Get Some!