The cast air filter housing can be installed by removing the right battery and mounting the bracketry. A formed elbow connects the turbo compressor inlet with the air cleaner housing. A short piece of hose also connects the housing inlet to a plastic air inlet that protrudes through the radiator support. The hole is prepunched in most trucks. The reusable oiled cotton-gauze free-flow filter can be installed, and the air filter top can be bolted in place. A breather hose also connects the CDR valve with the air filter.