Evolution Line (Titanium) Audi RS 7 SportbackMFG# S AU TI 4H Audis high performance RS models are an ideal match for the expertly styled and beautifully engineered Akrapovi Evolution exhaust systems. The Evolution gives more power, higher torque, decreases the weight, and delivers an unmistakable Akrapovi soundwhich has a deep sound at lower revs and a popping sound as things speed up when the throttle is lifted. This titanium exhaust system has cast collectors and three mufflers, with the