Our premier Diesel exhaust systems featuring lifetime backed stainless steel construction and mirror polished finishes on the muffler and welded tips. All MagnaFlow Performance DPF systems include a polished SS muffler. No hassle emissions legal design. MF Series Performance Filter-Back Diesel Exhaust System; 4in.; Incl. Tubing/6x6x14 in. Muffler/Tailpipe/Dual 5 in. Polished Tip; DualSameSideBehindPass.RearTireExit; Stainless; The premier Diesel exhaust system featuring stainless steel construction and mirror polished finishes on the muffler and welded tips. No hassle emissions legal design.