Tomei Expreme Ti Titanium Catback Exhaust - Nissan 370Z 09-15 (Left Single Exit)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. We have poured our knowledge into it all. When you see our EXPREME Ti system, you can then understand that ours is unrivaled. The exhaust flow design was the main focus in the pipe design, the best pipe thickness for weight and strength