Banks 25999 Monster Boost Tube Upgrade Kit for 2017-2019 GM 6.6L Duramax L5P

Vehicle Fitment

• 2017-2019 Chevrolet Silverado 2500 HD (6.6L Duramax Diesel)
• 2017-2019 Chevrolet Silverado 3500 HD (6.6L Duramax Diesel)
• 2017-2019 GMC Sierra 2500 HD (6.6L Duramax Diesel)
• 2017-2019 GMC Sierra 3500 HD (6.6L Duramax Diesel)

Features

• Monster boost tube upgrade kit engineered to maximize airflow for L5P Duramax
• Mandrel-bent 3.5" constant-diameter aluminized steel tubes for superior flow
• Up to ~87 % more airflow versus restrictive stock boost tubes
• Unique billet aluminum cold-side adapter improves pressure retention
• Heavy-duty 5-ply silicone couplers for high-boost reliability
• Spring-loaded constant-tension clamps prevent leaks and blown hoses
• Includes bung for temperature probe monitoring boost tube temps
• Compatible with stock and many aftermarket intercoolers (stock inlet/outlet location)

Specifications

• Brand: Banks Power
• Part Number: 25999
• Product Type: Monster boost tube upgrade kit
• Tube Diameter: 3.5" constant diameter
• Material: Mandrel-bent aluminized steel
• Couplers: 5-ply silicone
• Clamps: Spring-loaded constant-tension
• Fitment Years: 2017-2019
• Compatible Engine: 6.6L Duramax L5P turbo diesel
• Emissions: 50-state compliant (CARB EO D-161-155)

Included Components

• Mandrel-bent 3.5" boost tubes (hot and cold side)
• Billet aluminum cold-side pressure adapter
• 5-ply silicone couplers
• Spring-loaded constant-tension clamps
• Temperature probe bung

Product Description

The Banks 25999 Monster Boost Tube Upgrade Kit is designed to improve airflow and turbo response on 2017-2019 Chevrolet Silverado and GMC Sierra 2500/3500 HD trucks equipped with the 6.6L Duramax L5P diesel engine. Featuring mandrel-bent 3.5" constant-diameter aluminized steel boost tubes, this kit delivers up to an ~87 % increase in airflow compared with restrictive stock pipes while improving boost pressure retention and turbocharger efficiency. The unique billet aluminum cold-side adapter smooths airflow transitions and helps maintain higher air density under boost.

Banks' heavy-duty 5-ply silicone couplers and spring-loaded constant-tension clamps ensure secure, leak-free operation even under high-boost conditions. A bung for a temperature probe allows monitoring of intercooler piping temps. The boost tubes are engineered for direct compatibility with the stock intercooler or many aftermarket cores that retain the stock inlet/outlet size and location, making this kit a straightforward upgrade to enhance throttle response, reduce turbo lag, and support higher performance potential in L5P Duramax applications.