DNA Motoring CBE-370-D CBE370D Stainless Steel Catback Exhaust System Dyno proven to instantly increases 15 -25 horsepower/ low end torque TIG welded CNC machine flange for resistance against pressure and corrosion Aggressive deep sound while ensures smooth exhaust gas flow Increase engine output and efficiency Inlet/ Muffler exhaust tips: 2.25"/ 4.50" (slanted and Burnt)/ major piping diameter: 2.25"/ gaskets and hardware included Color: Chrome / Burnt Tip Surface Finish: Chrome Polished Stainless Steel Inlet / Outlet Diameter: 2.25&#034;/ 4.50&#034; Tip Diameter (IN): 4.5&#034; Tip Type: Dual Burnt Tips Diameter: 2.25&#034; Piping 09-16 Nissan 370Z Z34 Fairlady Z (Fits Models with 3.7L VQ37VHR V6 Engines ONLY) Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and Durability Gaskets and Hardware Included Notes: Installation instruction is not included. Professional installer is highly recommended! There are a few benefits that come from using an exhaust cat back system, such as increased horsepower and fuel efficiency, as well as, an aggressive sound and stunning aesthetic. But to fully grasp these benefits we first must understand the engines combustion cycle. Increase in horsepower, torque, and MPG Louder, more aggressive tone Stylish appearance Quality Materials Our professional technicians do heavy research and development in testing car applications and fitments for our products. We also do rigorous testing on the strength, durability, as well as longevity of the material in order to make sure when the product arrives at the consumers end that its ready to go without worries.