The muffler that started it all, the original 40 Series Muffler is an aggressive sounding street/strip muffler that delivers a powerful ?Flowmaster? Sound? you?ve heard so much about it. If you really want to hear your exhaust system and that great muscle car tone ? from both inside and out of the vehicle ? the 40 Series is for you.
Our largest and quietest muffler, the 50 Series Big Block Mufflers is made for tow vehicles, full-size trucks, large SUV?s and RV?s / Motor Homes. More than just compatible with big cubic inch engine applications, the 50 Series Big Block incorporates a very large Resonance Tuning Chamber to almost completely reduce interior sound in large cab vehicles and enough case volume to handle engines under heavy loads ? perfect for tow vehicles. Significant improvements in mileage, torque, and horsepower are to be expected from this muffler, as well as decreased engine heat and wear.