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Banks Boost Tube Upgrade Kit (Set) for 2017-2019 GM 6.6L L5P Duramax

Pricing: $598.50

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Increases throttle response and reduces turbo lag

Banks massive 3.5" boost tubes are the largest on the market, flowing 87% more air than stock! Smooth mandrel-bent tubes deliver more air to your engine while reducing boost pressure loss resulting in quicker turbo spool and more power.


Banks Boost Tubes are the largest tube in the industry at a full mandrel bent 3.5" compared to competitors’ 3” and the stock 2.5" crush-bent tubes. Made of high-quality aluminized steel, Banks Boost Tubes allow for a quicker turbo spool by improving boost pressure retention (increasing air density) between turbo, intercooler, and intake resulting in maximum horsepower.

The Banks Tube Upgrade Kit works with the stock Duramax intake elbow and intercooler by using proprietary high-strength 5-ply silicone couplers and a unique billet aluminum cold-side adapter to further boost airflow.

  • Improves airflow
  • Greater cooling capacity
  • Allow the turbocharger to spool up faster
  • Constant diameter tubing for the best flow
  • Billet venturi couplers maintain boost pressure
  • Compliments Derringer Tuner, Ram-Air Intake , and Monster Exhaust
  • Bung for a temperature probe
  • 5-ply heavy-duty silicone couplers
  • Spring-loaded constant tension clamps
  • Mandrel-bent aluminized steel construction
  • Huge increase in size and flow over stock and competitors (3.5" vs 2.5")

Emissions Compliant: 49 State

Flow Improvement

A better flowing intercooler tube and a unique billet intercooler coldside adapter results in less boost pressure loss allowing for more air and fuel to be delivered to your engine. This 87% improvement in airflow is the highest in the industry, resulting in maximizing horsepower, reducing stress on intake components, and improved turbo spool response.

Banks Power Boost Tube CFM chart for 25999 Duramax 6.6LBanks vs Stock 25999 comparison of Intercooler tubes


  • Diameter: 3.5-inch
  • Material: Aluminized Steel
  • Finish: Red powder-coated

Larger Diameter:

  • Banks: 3.5-inch diameter
  • Stock: 2.5-inch diameter

Works with:

  • Stock intercooler
  • Stock intake elbow


Install Manual


Installation Instructions



Shipping Information

  • Item Requires Shipping
  • 25.0 lbs.
  • W10.0000” x H8.0000” x L20.0000”
  • Free Shipping - Ground

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