Flowmaster’s American Thunder cat-back exhaust system for your 2018-up 6.4L (392ci)-powered Dodge Durango a bark that matches its bite! The American Thunder exhaust system is composed of mandrel bent 3.0-inch stainless steel tubing for maximum exhaust flow and durability, Super 44 series mufflers for an aggressive-to-moderate sound level, tuned resonators to control interior sound and maintain driver comfort, and larger 4.0-inch stainless steel tips for that custom look. Backed by Flowmaster’s L