High quality production, for true competition use without compromise. Only the best Titanium grade materials are used. From the special racing layout design, made as straight as possible, to the high flow silencer. 80MM (OD) pipe diameter with 115MM muffler tip diameter. the Tomei Expreme Ti Exhaust is one of our favorite exhaust systems for the Nissan S-Chassis and the absolute lightest for the Z33 Crowd.