For Nissan 350Z/Infiniti G35 4.7" Dual Muffler Tip Hi-Power Catback+Header+Downpipe - Fairlady Z33 VQ35 Made of High Quality T-304 Stainless Steel Material; TIG Welded CNC Machine Flange Increase Engine Output and Efficiency; Instantly Gains Up to 10 - 15 Hp./Tq. Catback - Muffler Tip Type: Dual Slanted Burnt Tip / Tip Diameter: 4.5" / Inlet Size: 2.25" Header - O2 Sensor Bung Insertion / Metal Gasket Included / Inlet: 2.25" / Outlet: 2.25" Downpipe - Inlet Size: 2.25" / Outlet Size: 2.25"