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Scorpion Exhaust Cat-Back Twin STW - BMW E90, E91, E92 325/328/330 06-07 Road XR80R 1986-2003 is part ofThe Scorpion Car Exhaust Cat Back System BMW E90, E91, E92 325 328 330 2006 2007 is part of the latest Scorpion Exhausts collection. CAT BACK SYSTEM 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 76mm