Installation REQUIRES Cutting Original (O.E.) Equipment Exhaust System. This 3" diameter BORLA® Axle-Back system features the aggressive ATAK® sound level. ATAK®, Acoustically-Tuned Applied Kinetics, technology is based on specifically-tuned attributes of the internal muffler cores, which are calibrated on a vehicle-by-vehicle basis to deliver the most desirable sound. Even though the sound on the exterior is uncompromising, there is no resonance inside the vehicle, a product of painstaking engineering and over 40 years of experience. BORLA® systems unleash hidden horsepower. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive BORLA® Sound of Power respected by motoring enthusiasts everywhere. The system exits through single 4.5" round bright chrome on T-304 stainless steel tips on each muffler. Each system is built from premium T-304 stainless steel, superior to T-400 series knockoffs (such as 409), to give you the absolute best in performance and durability. Ultra-smooth mandrel bends ensure maximum flow & power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit. Best of all, BORLA® stands behind every system with a Million-Mile Warranty. Just what you’d expect from the world’s most experienced (and most winning) exhaust brand.