For Scion tC 4" Muffler Tip Stainless Steel Catback+Manifold Header Exhaust System - VVTi 2AZ-FE 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: Rounded Tip / Tip Diameter: 4" / Inlet Size: 2.25" / Main Piping Diameter: 2.25" / Removable Silencer Included Header - O2 sensor bung insertion / Metal gasket included / Inlet: 1.5" / Outlet: 2.375"