CSF Heavy Duty Intercoolers are the perfect upgrade for your 11-12 6.6L TD Silverado/Sierra HD. The Heavy-Duty Bar & Plate Construction All-Aluminum Cast End Tanks have been Pressure Tested at 120 psi for Maximum Reliability in Extreme Boost Applications. This intercooler is a true "Drop-in Fit" installation with precise OEM-Style inlet/outlet connections and requires no modifications. In addition, each cooler comes finished in CSF's Thermal Rejection Powder-Coating for greater cooling performance and a sleek OEM+ look. Thermal Rejection coatings offer up to 15% improvement in heat dissipation over non coated intercoolers.This Part Fits: Year Make Model Submodel 2015-2016 Chevrolet Silverado 2500 HD High Country 2011-2016 Chevrolet Silverado 2500 HD LT 2011-2016 Chevrolet Silverado 2500 HD LTZ 2011-2016 Chevrolet Silverado 2500 HD WT 2015-2016 Chevrolet Silverado 3500 HD High Country 2011-2016 Chevrolet Silverado 3500 HD LT 2011-2016 Chevrolet Silverado 3500 HD LTZ 2011-2016 Chevrolet Silverado 3500 HD WT 2015-2016 GMC Sierra 2500 HD Base 2011-2016 GMC Sierra 2500 HD Denali 2011-2016 GMC Sierra 2500 HD SLE 2011-2016 GMC Sierra 2500 HD SLT 2011-2014 GMC Sierra 2500 HD WT 2015-2016 GMC Sierra 3500 HD Base 2011-2016 GMC Sierra 3500 HD Denali 2011-2016 GMC Sierra 3500 HD SLE 2011-2016 GMC Sierra 3500 HD SLT 2011-2014 GMC Sierra 3500 HD WT