For Nissan 350Z/Infiniti G35 4.5" Dual Burnt Tip Hi-Power Catback+Manifold Header Exhaust System - Z33 V35 Made of High Quality Stainless Steel Material TIG Welded CNC Machine Flange Increase High Flow Air and Maximize Performance; Instant Gain 10 to 15 Hp. / Tq.; Aggressive Deep Sound while Ensures Smooth Exhaust Gas Flow Catback - Muffler Tip Type: Dual Slanted Burnt Tip / Tip Diameter (IN): 4.5" / Inlet Size(IN): 2.25" Header - O2 sensor bung insertion / Metal gasket included / Inlet: 2.25" / Outlet: 2.25"