RBP RBP-67408-BC Black 4" Stainless Steel High Temperature Heat Treated Coating DPF Back Exhaust System for Long or Short Bed 4 inch mandrel bent stainless steel tubing to fit the new 2007.5-2009 Dodge 6.7 diesel, it also includes a 5 inch inter cooled tip, single side exit, black coated exhaust system and will not discolor Easy to install and fits in existing OEM hangers This exhaust system lowers exhaust gas temperature, increases fuel economy, horsepower and torque Best fitting system on the market Will not void your factory warranty