Taliaferro downpipe in 3inch with 4inch Magnaflow Metallic RaceCat. Stainless construction. Tig Welded. For stage 3 on the 9-3 SS/SC 2003-2007 4cyl. (For 2007- with dual catalyst will only work with catback 4006319) No extension cable required. For 2003MY cars the temp sensor is not included as it was deleted in the factory software updates. Must be used with stage 3 software for proper function. Will Mate to stock or 2.5" catback. Has both 02 bungs.