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Scorpion Exhaust Cat-Back (Res) - Audi TT RS 09-14 Seat Covers RIEJU MARATHON 450 CROSS 2011The Scorpion Car Exhaust Cat Back System (Resonated) Audi TT RS 2009 2014 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 76mm Tailpipe Uses OE