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Scorpion Exhaust Cat-Back (Res) Twin Daytona - Audi RS3 11-12 EXCLUDE FROM CODE EXC/EXC-F 2004-15 is part ofThe Scorpion Car Exhaust Cat Back System (Resonated) Audi RS3 2011 2012 is part of the latest Scorpion Exhausts collection. CAT BACK SYSTEM (RESONATED) A catalyst is a key component in emission control. It is also the most restrictive component of an exhaust. Our Sports Catalysts increase the gas flow while maintaining filtration rates. Our decats simply replace the catalyst altogether for the ultimate flow rate. Pipe Diameter 63. 5mm Tailpipe Twin