Some vehicles are equipped with two catalysts due to their dual pipe assembly. The Secondary Catalyst Bypass pipe removes the secondary catalyst to further improve gas flow and reduce restrictions caused by catalysts within the exhaust system. - Removes the secondary catalyst for improved gas flow - Reduces restrictions within the exhaust system - Designed for vehicles with dual pipe assemblies Specifications: - Pipe Diameter: 76.20 - Race Product: No - EMarked: No Kit comes with: - MSNI104: Y Pipe - MSNI104 - MSNI106: Connecting Pipe - MSNI106 Vehicle Compatibility: - Nissan GT-R R35 2009-2015