Are you running the new bad-ass Banks Monster-Ram for the 6.7L Cummins? Banks cold-side boost tube is larger than the factory pipe and designed to work with the new Banks 3.5" and 4" Monster-Ram which will improve airflow, and allow the turbocharger to spool up faster. Banks cold side tube has 40 percent greater flow area than stock. Produced from high-quality aluminized steel, our tubes are mandrel bent for constant diameter. This increases performance by allowing quicker turbo spool. Better flowing intercooler tubes improve retention of boost pressure (increases density) between turbo, intercooler, and intake resulting in maximum horsepower. Our powder-coat finish stops before the end of the tube for better grip ensuring our 4- and 5-ply heavy-duty high-temperature silicone couplers hold tight under high-boost conditions. Spring-loaded constant tension clamps maintain a stronger grip to prevent leaks or blown boots. This boost tube is designed for serious horsepower. Designed to give you a greater cooling capacity, Increase performance and lower EGTs, Mandrel-bent aluminized steel construction, Constant diameter tubing for the best flow, Perfect fit and finish, 4- and 5-ply heavy-duty silicone couplers, Spring-loaded constant tension clamps, Combine with Banks 3.5 or 4 inch Monster Ram for the most power, Details: Diameter: 3.5 in. Material: Aluminized Steel Finish: Gray powder-coated Driver side, Cold side only, Larger Diameter: Banks: 3.5 inch diameter Stock: 2.73 inch diameter Banks has 40% greater, flow area than stock. Better flowing intercooler tubes results in less boost pressure loss allowing for more air and fuel to be delivered to your engine resulting in maximum horsepower. This kit is designed to work with the stock intercooler (or aftermarket intercooler with stock inlet and outlet size and location).