This cat-back exhaust system is constructed of 3 IN - 2-1/2 IN mandrel-bent brushed finished 304 stainless steel tubing for maximum strength and durability. This system features high-flow 304 stainless steel mufflers, producing a deep sound. Finishing off this exhaust system are quad 3-1/2 IN diameter carbon fiber 304 stainless steel clamp-on exhaust tips. The tips features an aFe POWER logo for a unique style. This system produces a deep sound unleashing all available horsepower and torque. Utilizing a factory style flange and hangers this system is a direct bolt-on system, which requires no cutting or modifications for a hassle-free installation. This cat-back exhaust system uses a heavy duty flex pipe with an internal interlock liner for added strength and durability. A mitered merge x-pipe is used to balance and evenly distribute exhaust pulses traveling through the exhaust system, minimizing exhaust drone and maximizing scavenging. 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. State-of-the-art computer-aided design technology is utilized for precise vehicle fitment. 100% TIG-Welded for race-proven strength and durability.. MACH Force-Xp 3 IN to 2-1/2 IN Stainless Steel Cat-Back Exhaust System Carbon Audi RS6 Avant 21-25 V8-4.0L (tt). aFe 20-22 Audi RS6 Avant V8 4L (tt) MACH Force-Xp 3in to 2.5in 304 SS Cat-Back Exhaust w/ Carbon Tip. MACH Force-Xp 3 IN to 2-1/2 IN Stainless Steel Cat-Back Exhaust System Carbon. Quad 3-1/2 IN Diameter Carbon Fiber 304 Stainless Steel Clamp-On Exhaust Tips. Includes Factory Style Exhaust Valves (Using Factory Motor, Not Included). Utilizes Factory Style Flange and Hangers for a Secure Fit. 100% TIG-Welded for Strength and Durability. MACH Force-Xp Cat-Back Exhaust System. Cat-Back Exhaust

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