This system incorporates factory style exhaust valves which use the factory exhaust valve motors (not included). The valves help regulate, direct and control the flow of exhaust gases by opening, closing, or partially obstructing passageways depending on throttle position for maximum performance. This system features a high-flow stainless steel muffler, producing a mild sound. Muffler finish may vary. Features: Constructed from 3 IN - 2-1/2 IN Mandrel-Bent 304 Stainless Steel Tubing Quad 2-1/2 IN Diameter Polished 304 Stainless Steel Clamp-On Exhaust Tips Utilizes Factory Style Hangers for a Secure Fit Includes Factory Style Exhaust Valves (Using Factory Motor, Not Included) 100% MIG-Welded for Strength and Durability What's Included: aFe MACH Force-Xp 3" to 2.5" 304 Stainless Steel Cat-Back Exhaust System Emissions Disclaimer:This product does not require a CARB EO#.