MBRP 2.5" Cat Back Exhaust System For Audi B9 S4/S5

The MBRP high flow performance exhaust systems maximize exhaust flow so your engine keeps its cool with lower exhaust temperatures. Your reward will be greater fuel efficiency; more torque; more horsepower; and last but not least a sound that is pure MBRP. 

Features: 

• 24% Flow Increase
• Eliminates Exhaust Valves with Electronic Valve Simulators
• Easy Bolt-on Installation
• 4" Quad Carbon Fiber Tips
• Moderate Tone