The AFE 49-03065 Atlas Dual 4 Inch Filter-Back Exhaust System is a great choice for those looking to improve their 6.7 Powerstroke 2011-2014. This system will add 8HP and 11 Ft-Lbs. of torque over stock, and is made from 4" mandrel bent construction for durability and performance. Additionally, it uses high quality band clamps for a secure fit, and features intercooling tailpipes that reduce exhaust gas temperatures. This system installs from the filter-back for easy installation.