For Acura RSX 4" Muffler Burnt Tip Catback+Manifold Header Exhaust System - Non-S DC5 K20A3 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" / Removable Silencer Included Header - Metal gasket included / Inlet: 1.75" / Outlet: 2.5" / Piping Diameter: 1.75" Manifold piping and 2.5" Major piping