American Thunder Series

American Thunder® systems produce the ‘original’ Flowmaster sound …in most cases a very aggressive sound level. American Thunder systems use various chambered mufflers to achieve the performance gains and aggressive sound that enthusiasts lust for in their car or truck, inside and out. Available in stainless steel or economical aluminized steel, American Thunder systems are a great choice when you want to be heard.

FlowFX Series

Flowmaster’s line of FlowFX exhaust systems are perfect for the person looking for a moderate exterior and interior sound level with all of the performance benefits that you would expect from Flowmaster. New features include bright 409S stainless steel tubing mated to our top-quality FlowFX straight-through mufflers with a large 3.00 inch core for maximum performance and a deep, aggressive sound.

Force II Series

Force II® systems are designed for those who want the famous Flowmaster performance gains, but prefer a milder tone to the exhaust sound. Perfect for daily driven vehicles, Force II systems utilize our larger displacement mufflers for additional sound control and often feature custom-tuned resonators for very mild interior tones. Force II systems are available for many popular cars, trucks and SUVs in both stainless steel and economical aluminized steel.

Outlaw Series

Outlaw® exhaust systems are ideal for those looking for the ultimate aggressive exhaust sound levels. These systems feature our race-bred Outlaw mufflers and deliver extremely aggressive sound levels inside and out. On catalytic converter equipped vehicles, Outlaws deliver very aggressive tones and may be street-compatible in some areas. All Outlaw systems are manufactured from 409S® stainless steel for maximum durability.

Signature Series

Flowmaster’s Signature Series Exhaust Systems combine performance, durability, and style in one powerful package. Built from premium brushed 304 stainless steel with black chrome tips and precision TIG welding in the USA, these systems offer a bold, moderate exhaust tone with dyno-proven gains of up to 21 hp and 26 lb-ft of torque. Designed for popular mid and full-size trucks like the GM 1500, Ford F-150, Ram 1500, Bronco, and Tacoma, the Signature Series delivers improved exhaust flow, aggressive sound, and rugged styling.

Discover the ultimate in performance exhaust with Flowmaster's full lineup of premium muffler series, including American Thunder, Flowmaster Outlaw, FlowFX, Force II, and the Signature Series. Whether you're upgrading a muscle car, truck, SUV, or classic vehicle, Flowmaster has the perfect exhaust system to deliver the aggressive sound, increased horsepower, and enhanced torque you're looking for. Flowmaster exhaust systems are known for their distinctive tone, high-performance design, and durable construction. Shop by series to find the right fit for your street car, off-road build, or daily driver. From deep, powerful exhaust notes to moderate or mild sound levels, Flowmaster’s American-made mufflers offer superior flow dynamics, dyno-tested gains, and a variety of configurations including axle-back, cat-back, and full exhaust kits. Whether you're looking for maximum performance or street-legal sound, Flowmaster delivers unmatched quality and innovation in every exhaust system.

Exhaust Series

Explore Flowmaster’s full line of different series to find the perfect exhaust for your ride. Choose from American Thunder, Force II, FlowFX, Outlaw, and Signature Series—each offering unique sound levels and performance. Whether you want aggressive tone or mild street sound, there’s a system built for your style.