Banks 25936 3" Boost Tube Upgrade Kit for 2004.5-2009 Chevy/GMC 6.6L Duramax

Vehicle Fitment

• 2004.5-2009 Chevrolet Silverado 2500/3500 HD (6.6 L Duramax LLY/LBZ/LMM, driver-side pipe, RWD/4WD)
• 2004.5-2009 GMC Sierra 2500/3500 HD (6.6 L Duramax LLY/LBZ/LMM, driver-side pipe, RWD/4WD)

Fitment Notes

• Driver-side intercooler boost tube only; does not include intercooler boot
• Not compatible with LB7 engines (pre-2004.5) or 2010+ LML models
• Lowers EGTs and improves turbo spool when paired with stock or aftermarket intercooler

Features

• Mandrel-bent 3.00" constant-diameter aluminized steel tube improves airflow by ~60 % over stock (~2.375")
• Red powder-coat finish stops before tube ends to improve coupler grip
• Includes spring-loaded constant-tension clamp and heavy-duty silicone coupler
• Spools turbocharger faster and maintains boost pressure for better throttle response
• Reduces exhaust gas temperatures under load
• Works with factory intercooler or aftermarket with stock inlet/outlet dimensions
• Emissions compliant CARB EO D-161-107 for use in all 50 states
• Direct-fit upgrade - no cutting or trimming required

Specifications

• Tube Diameter: 3.00" constant bore
• Material: Mandrel-bent aluminized steel
• Finish: Red powder-coat
• Flow Improvement: ~60 % over stock
• Clamp Type: Spring-loaded constant-tension
• Compatibility: Driver-side only; stock or Banks intercooler inlet/outlet size/location
• CARB EO#: D-161-107
• Origin: USA

Included Components

• 1x 3.00" boost tube (driver-side)
• 1x Heavy-duty silicone coupler
• 1x Spring-loaded constant-tension clamp

Product Description

The Banks 25936 Boost Tube Upgrade Kit replaces the restrictive driver-side cold-side intercooler tube on 2004.5-2009 GM 6.6 L Duramax trucks (LLY, LBZ, LMM engines). Constructed from high-quality aluminized steel and featuring a 3.00" constant diameter design, it delivers approximately 60 % greater airflow compared to the OEM tube, enhancing turbocharger spool-up and throttle response while reducing EGTs under load.

Finished in red powder-coat and paired with a heavy-duty silicone coupler and spring clamp, this bolt-on upgrade ensures a secure, leak-resistant seal. Compatible with stock or aftermarket intercoolers with standard inlet/outlet geometry, the 25936 kit is emissions-compliant (CARB EO D-161-107) and designed for plug-and-play installation.

Ideal for towing, performance driving, or daily operation, the Banks Power 25936 kit offers measurable airflow gains, improved thermal efficiency, and enhanced throttle performance in factory-compatible setups.