Welcome to the finest catback exhaust for the B7 Audi S4 on the market. The AWE Touring Edition Exhaust for the B7 S4 is a direct bolt on catback system that not only transforms the rear end of the car with its menacing quad tips, but also turns heads with a deep muscluar bass note. Each cat back system features an H-Pipe crossover tube at the front to maximize exhaust scavenging for maximum power, as well as to take a harsh edge off the exhaust sounds. Tubing diameter for the entire system is 2.25". This is a deep bass tone, no matter how you cut it. Dyno proven for legitimate power gains of 14.2 hp and 14.8 lb-ft torque corrected to the crank on our in house Mustang AWD dynamometer, the B7 S4 Performance Exhaust is a must have for any B7 enthusiast.. AWE Tuning Audi B7 S4 Touring Edition Exhaust - Polished Silver Tips. Dyno-verified gains of 11 hp and 12 lb-ft of torque at the wheels. AWE Touring Edition Exhaust for Audi B7 S4 - Chrome Silver Tips. Available with Chrome Silver or Diamond Black tips. AWE Touring Edition for Audi B7 S4 - Chrome Tips. The ultimate exhaust solution for the 4.2L. No Check Engine Light – Guaranteed. Features AWE’s Lifetime Warranty. Perfect Fitment – Guaranteed. Deep, sophisticated V8 tone. Aggressive quad tip design. Touring Exhaust

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