Description 4" Filter Back 2007-2012 RAM 2500/3500 Cummins 6.7L, Single Side Exit- No Muffler, T409 Stainless Steel 2007-2012 Dodge Ram 2500/3500 6.7L Cummins Filter Back System 4" Outside Diameter Tail Pipe T409 Stainless Steel without Muffler /or Tips