Banks massive 3.5" boost tubes are the largest and strongest on the market, flowing more air than stock! Replaces the failure-prone OEM plastic and rubber pieces that crack or split under pressure, leaving you stranded on the side of the road.Banks boost tubes are built from powder-coated aluminumized steel for strength to withstand high pressure and temperatures. Smooth mandrel-bent tubes deliver more air to your engine while reducing boost pressure loss, resulting in quicker turbo spool and more power.The Boost Tubes work with the stock Power Stroke intake components by using proprietary high-strength 5-ply silicone hoses and a billet aluminum venturi adapters for turbo outlet and throttle body connection. These are specially made for the airflow requirements of the 6.7L Power Stroke maintaining boost pressure and volumetric flow.Banks vs Stock. Banks Boost Tubes are the largest charge air cooler pipes in the industry, measuring in at a full 3.5 inches compared to the factory pipes are only 2.5 inches with crushed bent corners and flimsy plastic components that crack under stress and heat. By contrast, Banks Boost Tubes are made of high-quality aluminized steel for maximum strength and durability. With Banks Boost Tubes' smooth bends, your turbo can spool quicker thanks to improved boost pressure retention for maximum horsepower.Key Features: Huge increase in size and flow over stock and competitors. Constant 3.5in diameter tubing for the best flow. Billet venturi couplers maintain boost pressure. Mandrel-bent aluminized steel construction. Allow the turbocharger to spool up faster. Spring-loaded constant tension clamps. 5-ply heavy-duty silicone couplers