EXCEPT ZR2 & AT4X models. Fits Factory Split Rear Exit vehicles ONLY. This Cat-Back™ system features a True Dual design which REQUIRES cutting the Original Equipment (O.E) Y-Pipe. The 2.5" diameter inlet into 2.75" system has the famous BORLA® "S-Type" sound level with no drone inside the vehicle. The muffler contains an internal X-Pipe for increased performance and improved sound. This system features dual 3.5" X 3.28" 'square' bright chrome on T-304 stainless steel tips on each tail pipe. Installation REQUIRES removal of the O.E. Valance Tips. Systems with black chrome on T-304 stainless steel tips, carbon fiber tips ,and systems that reuse the O.E. tips are also available. BORLA® Cat-Back™ and Axle-Back exhaust systems feature patented straight-through and multi-core technology designed to unleash hidden horsepower. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive BORLA® Sound of Power respected by motoring enthusiasts everywhere. It is built with premium, high-quality austenitic T-304 stainless steel using computer numerical control (CNC) manufacturing techniques that ensures accurate fit and maximum performance. All this without the annoying drone often associated with performance exhaust systems. Give your Silverado or Sierra the performance and sound it deserves, bolt on a BORLA®. 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.