The Drone Buster Red Corsa DB Series Mufflers. More Horsepower and Torque with Great Muscle Car Sound. A distinctive new sound with crispness, edginess, boldness and the pure sound of horsepower unleashed-all of this WITHOUT THE DRONE inherent in other performance exhausts! Bold sound when you want it (under throttle). NO, or significantly lower resonance/drone at cruising speed. Fits most vehicles with 2.25″ and 2.5″ pipe diameters. 100% Premium Stainless Steel. Limited Lifetime Rust-Through Warranty. The Red Series Muffler has an aggressive with more street performance/race sound. Recommended for V8 vehicles only where increased power and sound are desired. Vehicles with headers and high-flow catalytic converters, or no catalytic converters. Aggressive exterior sound under throttle (esp. with headers and no cats). Features RSCTM sound cancellation technology to eliminate or significantly reduce drone/resonance + O.E. quality dissipative material to “soften” higher frequency noise.