Description. This Banks boost tube upgrade kit is a game - changer for your 2017 - 2019 Chevrolet or GMC 2500/3500 with a 6.6L L5P Duramax engine. The massive 3.5 - inch boost tubes are the biggest and best in the market. They flow an amazing 680 CFM, which is 87% more air than the stock tubes. With smooth mandrel bends, they send more air to your engine, leading to quicker turbo spool and a significant power boost. Most competitors offer only 3.0 - inch tubes, while the factory pipes are just 2.5 inches with weak parts. Banks Boost Tubes are made of high - quality aluminized steel for long - lasting toughness. Their seamless curves make the turbo spool up faster, increasing horsepower through better boost pressure. Part Number: 25999. Features: 87% better airflow than stock, 680 CFM flow, much larger size than stock and competitors, billet venturi couplers for boost pressure, mandrel - bent aluminized steel construction, constant - diameter tubing for optimal flow, faster turbo spool, spring - loaded constant tension clamps, 5 - ply heavy - duty silicone couplers, and greater cooling capacity. For installation, click here.

Using your Banks boost tube upgrade kit is simple. First, find a flat and safe place to work on your vehicle. Start by carefully removing the old, stock boost tubes from your 2017 - 2019 Chevrolet or GMC 2500/3500 with a 6.6L L5P Duramax engine. Take your time to avoid damaging any other parts. Then, install the new Banks boost tubes in the same position. Make sure to use the spring - loaded constant tension clamps and 5 - ply heavy - duty silicone couplers correctly for a tight fit. As for maintenance, it's a good idea to check the tubes regularly for any signs of damage, like cracks or leaks. If you notice any issues, replace the parts right away. Also, keep the tubes clean to ensure they keep performing well. When you're driving, be gentle on the accelerator to give the turbo and boost tubes a longer life. And always follow the vehicle's normal maintenance schedule to make sure everything works in harmony.