BORLA ATAK (Acoustically Tuned Applied Kinetics) technology is designed for high-performance purists who prefer exhaust sound over their stereos. ATAK-equipped exhaust systems deliver the highest available dB (decibel) levels int he BORLA street-legal lineup. And unlike inferior brands taht lose significant sound quality at higher volumes, ATAK is tuned like a graphic equalizer to shape and focus sound waves for optimum high-volume output. This product ships in approximately 1 days