The Aluminized PRO DPF Series has a limited 1 year warranty, a muffler-less design and mirror finish polished welded intercooled tips. The best value system with a no hassle emissions legal design. Pro Series Performance Diesel Exhaust System; 4in. Filter-Back; Incl. Tubing/Tailpipes/Single 5in. Round Aluminized Tips; Single Passenger Side Rear Exit; The PRO Series Features Aluminized construction with an Aluminized muffler and no tip. No hassle emissions legal design.