The PRO Series has lifetime backed stainless steel construction with a satin finish muffler and no tip, giving you the opportunity to customize it with an optional tip of your choice. Pro Series Performance Diesel Exhaust System; 4 in. Filter-Back; Incl. Tubing/Ext. Pipe/Tailpipe/Dual 5 in. Polished Tips; Dual Same Side Behind Pass. Rear Tire Exit; Stainless; The PRO Series Features stainless steel construction with a satin finish muffler and no tip. No hassle emissions legal design.