XForce Performance Exhaust System for Holden Commodore (03/2008 - 08/2010), Holden Commodore (04/2008 - 05/2013), Holden Commodore (01/2015 - on), Holden Commodore (05/2013 - 09/2015), Holden Commodore (07/2006 - 05/2013), Holden Commodore (09/2007 -...4 into 1 1 3 4 Primary Long Tube 3 Outlet Header with 3 Metallic Cat Converter Non Polished Stainless SteelFeatures 1 3 4 Long Tube Primary to 3 outlet 3 high flow metallic cat Polished stainless steel O2 extension looms are required Will not bolt to standard exhaust system Only work fit with our 3 7 Series cat