Flowmaster Delta Flow technology provides superior scavenging of exhaust gases, compared to a standard Flowmaster muffler. The key to Delta Flow technology is the three deflectors that form the delta shape inside the power chamber. This results in increase horsepower, torque and fuel economy, along with reductions in exterior sound levels and interior resonance.The "Flowmaster Sound" is the true tone of American muscle and performance. Available in a wide range of domestic and import applications for automobiles and trucks. Flowmaster mufflers produce more power than original equipment (OE) and competitive aftermarket products. What makes Flowmaster mufflers so unique is that its performance improvement is paired up with their unique exhaust tones. The Flowmaster sound is offered in many different tones depending upon the muffler series. From the aggressive tone of the 40 Series Flowmaster muffler, to a quiet and subtle , but unmistakable rich, Flowmaster muffler tone of the 70 Series, you will find the right application of performance and exhaust sound you want. Flowmaster mufflers are also now available in the 409 stainless steel.