This system has been developed to offer Nissan GT-R owners the opportunity to tune their car to its full potential. It is constructed using high-grade lightweight titanium alloys, with individual parts cast in the in-house foundry. The one-piece construction link pipe has an increased diameter, measuring 101.6 mm (4 inches) for optimized exhaust gas flow. It is beautifully completed with larger handmade high-quality carbon-fibre tailpipes (135 mm in diameter) over titanium inners and finished with an Akrapovic chicane design. With the addition of the mandatory Downpipe / Link Pipe Set (SS) or Link Pipe (SS), the Evolution Race Line is converted to a full system.If stock turbos are not replaced or are replaced with turbos with the same connection flanges between turbos and downpipes as on stock turbos, then the Downpipe / Link Pipe Set has to be added to complete the exhaust system. If the turbochargers are changed, then the Link Pipe without Downpipes has to be chosen. In any case, ECU remapping is mandatory.THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.