2-1/2" 304 Stainless Steel Construction: This system is constructed of 2-1/2" brushed finished 304 stainless steel tubing for maximum strength and durability. Installation: Utilizing factory style flanges this system is designed to fit in the stock locations with no cutting or modifications required for a hassle-free installation. High-Flow Catalytic Converters: High-flow catalytic converters are used for maximum flow. Computer-Aided Design: Utilizing state-of-the-art computer-aided design technology, this exhaust system is designed for custom, high tolerance factory fitment. TIG-Welded: 100% TIG-Welded for race-proven strength and durability. aFe POWER exhaust systems are engineered and manufactured in our Corona, California manufacturing facility. Twisted Steel 3 IN 304 Stainless Steel Street Series Connection Pipe w/ Cats Nissan 350Z 03-06 V6-3.5L Nissan 350Z 03-06 V6-3.5L