Boost Tube Upgrade Kit 2013-2018 Ram 6.7L Cummins Banks PowerIncrease flow area up to 103 percent over the stock 2 3 4 inch boost tubes with Banks' huge 3 1 2 inch OEM left and right side boost tubes. Stock hot side tube is dented at the factory, bringing it's diameter down to a tiny 2 1 4 inch. Banks boost tubes are 3 1 2 inch constant diameter mandrel bent with larger radius bends. More air allows for more fuel which means more horsepower. Banks hot and cold side tubes have up to 103 percent greater flow area