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; 4 in. Cat-Back; Incl. Tubing/7x7x24 in. Muffler/Tailpipe; No Tip Incl.; Single Pass. Side Rear Exit; Aluminized; The PRO Series Features Aluminized construction with an Aluminized muffler and no tip. No hassle emissions legal design.