4" Down Pipe Back, Single Side, T304, 2001-2007 2500/3500 Duramax, EC/CC
4" Down Pipe, Race Pipe, without bungs, AL, 2007-2012 2500/3500 6.7L
4" Down Pipe, Race Pipe, without bungs, T409, 2007-2012 2500/3500 6.7L
4" Filter Back - no muffler, Single Side, T409, 2007-2010 2500/3500 Duramax, All LMM
4" Filter Back, Cool Duals , T409, 2011-2015 2500/3500
4" Filter Back, Cool Duals , T409, 2016 2500/3500
4" Filter Back, Cool Duals, AL, 2007-2009 2500/3500 Cummins 6.7L
4" Filter Back, Cool Duals, AL, 2008-2010 F-250/350/450 6.4 L
4" Filter Back, Cool Duals, AL, 2011-2015 2500/3500
4" Filter Back, Cool Duals, AL, 2013 2500 Cummins 6.7L (All excl. CC/SB) (Leaf Spring)
4" Filter Back, Cool Duals, AL, 2014-UP 2500 Cummins 6.7L (All excl. CC/SB)
4" Filter Back, Cool Duals, AL, 2014-UP 2500 Cummins 6.7L (CC/SB)
4" Filter Back, Cool Duals, AL, 2015-2016 F-250/350/450 6.7 L
4" Filter Back, Cool Duals, AL, 2016 2500/3500
4" Filter Back, Cool Duals, T409, 2008-2010 F-250/350/450 6.4 L
4" Filter Back, Cool Duals, T409, 2013 2500 Cummins 6.7L (All excl. CC/SB) (Leaf Spring)
4" Filter Back, Cool Duals, T409, 2013 2500 Cummins 6.7L (CC/SB)
4" Filter Back, Cool Duals, T409, 2014-UP 2500 Cummins 6.7L (All excl. CC/SB)
4" Filter Back, Cool Duals, T409, 2014-UP 2500 Cummins 6.7L (CC/SB)
4" Filter Back, Dual Outlet Single Side, AL or BLK, 2011-2019 2500/3500
4" Filter Back, Dual Outlet Single Side, AL, 2007-2010 2500/3500
4" Filter Back, Dual Outlet Single Side, AL, 2008-2010 F-250/350/450 6.4L
4" Filter Back, Dual Outlet Single Side, AL, 2010-2012 2500/3500 Cummins 6.7L