For Acura Integra 4.5" Muffler Tip Catback+Manifold Header Exhaust System - DA9 DB1 B18A1 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 (IN): 4.5" / Inlet Size(IN): 2.25" / Removable Silencer Included Header - O2 sensor bung insertion / Metal gasket included / Inlet: 1.75" / Outlet: 2"