The Drone Buster Black 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 Black Series Muffler has the more aggressive with a wide open sound, delivers an extreme V8 sound, both inside and out! Recommended for V8 vehicles only where increased power and sound are desired. Vehicles with stock manifolds, stock catalytic converters and/or milder engines (will deliver a great street performance sound and distinctive tone). Vehicles with headers and high-flow catalytic converters, or no catalytic converters (will deliver extreme V8 muscle/race car sound). Very aggressive exterior sound under throttle (esp. with headers and no cats). Features RSCTM sound cancellation technology to eliminate or significantly reduce drone/resonance.