For Subaru Impreza WRX 4.5" Muffler Tip Catback+2-Piece Manifold Header Exhaust System - EJ GD GG 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: 4.5" / Inlet Size: 3" / Removable Silencer Included Header - O2 sensor bung insertion / Metal gasket included / Inlet: 1.5" / Outlet: 2"