FLOWMASTER AMERICAN THUNDER AGGRESSIVE TONE CHAMBERED MUFFLER EXHAUST SYSTEMS. Flowmaster's American Thunder aggressive tone chambered muffler exhaust systems include mandrel-bent steel tubing and a chambered muffler that's fine-tuned to deliver improved torque, horsepower and gas mileage, plus the moderately aggressive rumble you crave for your street machine. Offered in aluminized or stainless steel. Chambered muffler fine-tunes exhaust tone to moderately aggressive rumble.
Mandrel-bent tubing allows for continuous airflow. Direct fit by vehicle year, make and model.Proven to improve torque, throttle response, horsepower and fuel economy by rigorous dyno testing. Brand New in the Box - Fit and Quality Guaranteed! Includes 50 Series Delta Flow Muffler. WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. Compatible with the following vehicles.