Includes Hybrid models. Will NOT fit with optional bed step. This 2.5 in. diameter Cat-Back system features a True Dual design with two full tail pipes (Not just a single tail pipe with dual tips) that is unique in the industry. It was designed specifically for the Tundra 3.4L. The system features the aggressive Borla ATAK muffler and Polyphonic Harmonizer Technology inside the muffler assembly which utilizes patented units that contain pipes of different diameters and lengths to create multiple exhaust notes that harmonize to deliver a clean, rich, full-bodied sound without any drone. The system also features a Merge X-Pipe for increased performance and improved sound. The system is finished off with single 4.5 in. round bright chrome on T-304 stainless steel tips on each tail pipe. Systems with black chrome on T-304 stainless steel tips, and carbon fiber with black anodized center tips are also available. Add Extension Pipes 60734 for Crew Cab with Standard Bed (6' 6 in.) 157.7 in. Wheelbase vehicles. Add Extension Pipes 60735 for Extended Cab with Long Bed (6' 1 in.) 164.6 in. Wheelbase Vehicles. It is built with premium, high-quality austenitic T-304 stainless steel for a sharp appearance and long life. Our computer numerical control (CNC) manufacturing techniques ensures accurate fit and maximum performance. Mandrel bends ensure maximum flow & power.