Banks Power Exhaust Header System (1991-1999 Wrangler 4.0)With more power, quicker acceleration, and tougher construction than ever, the new Banks Revolver out muscles any competitive exhaust manifold. Period! You'd think that being made from super durable, mandrel bent 409 stainless steel tubing and sporting a 1 2 inch thick precision ported and machined flange was enough but there's more. The header is fortified with a Revolver collector which features Banks' patented Power Pickle exhaust collector