Flowmaster Pro Series Muffler

The internal construction of the Flowmaster Pro Series is T409 stainless steel and the outer case is fabricated from rugged 18-gauge aluminized steel. With part numbers available in 3" and 4" pipe diameters and three body lengths from 20" to 12", we have the solution for your needs. The bottom line is that if you want to make more power, quietly, Flowmaster Pro Series is the answer. In our continuing endeavor to bring the latest in performance and sound control technology to the street and race track, Flowmaster is proud to introduce its newest line of performance Pro Series mufflers. These round-cased mufflers deliver ground breaking sound control while delivering maximum power and exhaust system efficiency. The Pro Series mufflers work on all applications ranging from street trucks, to sled pullers, to your everyday work truck. During development, at the dyno and track, the new Flowmaster Pro Series mufflers consistently delivered performance that is equal to or surpasses open pipe systems, while dramatically reducing sound levels across the RPM range. On a modified GMC diesel truck, racing on the DHRA circuit, one engine builder found 33 lbs/ft of torque and 13 horsepower at 2,850 RPM. Only a simple change out to the Flowmaster from a competing performance muffler was made.