Banks Power Boost Tube Upgrade Kit Cold Side (3.5in)

Dodge Ram 2500 / Ram 3500 07-09 6.7L Diesel/5.9L Diesel

Part #: 25991

Overview

The Banks Power Boost Tube Upgrade Kit Cold Side (3.5in) is a direct OEM replacement for the driver side (cold side) boost tube on 2007 to 2009 Dodge Ram 2500 and 3500 trucks equipped with the 6.7L Cummins engine. Designed for enthusiasts seeking enhanced performance, this upgrade significantly improves airflow from the turbocharger to the intake by increasing the flow area by 40% compared to the stock boost tube. By reducing boost pressure loss, it allows your engine to receive more dense air and fuel mixture, resulting in improved horsepower and throttle response.

Ideal for serious horsepower builds and daily drivers alike, this boost tube maintains greater air density through the intercooler system, promoting quicker turbo spool and more efficient combustion. Whether you’re looking to maximize power gains or improve overall engine efficiency, the Banks cold side boost tube is engineered to deliver reliable, high-performance results.

Key Features

This cold side boost tube upgrade offers a range of advanced features designed to optimize airflow and durability:

• Cold Side (Driver Side) Boost Tube only, engineered for precise fitment
• 3.5-inch constant diameter tubing versus stock 2.73-inch for superior flow
• 40% greater flow area compared to OEM tubes, reducing boost pressure loss
• Mandrel-bent aluminized steel construction for consistent diameter and strength
• High-quality 4- and 5-ply heavy-duty silicone couplers for secure, leak-free connections
• Spring-loaded constant tension clamps maintain tight grip under high boost conditions
• Powder-coat finish stops short of tube ends to ensure better coupler grip
• Improved cooling capacity helps lower exhaust gas temperatures (EGTs)
• Compatible with stock elbow or Banks Monster-Ram Gen 2 for enhanced airflow and faster turbo spool

Construction & Design

The Banks cold side boost tube is crafted from premium aluminized steel, chosen for its corrosion resistance and durability under extreme heat. The tubing is mandrel bent to maintain a constant 3.5-inch diameter throughout its length, eliminating restrictions and turbulence that can occur with stock tubes. This smooth, consistent airflow path promotes faster turbocharger spool and improved boost retention.

To ensure a secure and reliable seal, the kit includes heavy-duty silicone couplers with multiple plies for enhanced strength and heat resistance. The powder-coat finish not only protects the tube but also stops short of the ends to provide a better grip surface for the couplers. Spring-loaded constant tension clamps further guarantee a leak-free connection, even under high boost pressures and thermal expansion.

Performance & Sound

By increasing the flow area and maintaining boost pressure more effectively, the Banks cold side boost tube helps your turbocharger spool faster and more efficiently. This results in improved throttle response and increased horsepower potential. Additionally, the enhanced cooling capacity helps reduce exhaust gas temperatures, contributing to overall engine longevity and performance stability. While primarily focused on airflow improvements, the upgrade may also contribute to a more responsive and aggressive turbo sound characteristic of high-performance diesel setups.

Installation & Fitment

The Banks Boost Tube Upgrade Kit is designed as a direct OEM replacement for the driver side cold side boost tube on 2007–2009 Dodge Ram 2500 and 3500 trucks with the 6.7L Cummins engine. Installation is straightforward and requires no modifications to existing components. The kit fits seamlessly with the stock elbow or can be paired with the Banks Monster-Ram Gen 2 elbow for further airflow enhancements. Professional installation is recommended to ensure proper fitment and clamp tension.

What's Included

• 1 x 3.5-inch mandrel-bent aluminized steel cold side boost tube (driver side)
• 4-ply and 5-ply heavy-duty silicone couplers
• Spring-loaded constant tension clamps
• Installation hardware and instructions

Ideal For

This boost tube upgrade is ideal for Dodge Ram 2500 and 3500 owners with the 6.7L Cummins engine from 2007 to 2009 who are looking to improve turbo efficiency, increase horsepower, and reduce boost pressure loss. It suits enthusiasts building serious horsepower setups, daily drivers seeking better throttle response, and anyone wanting a durable, high-quality replacement for the factory boost tube. Pairing this kit with the Banks Monster-Ram Gen 2 elbow maximizes airflow gains for the ultimate performance upgrade.

Banks Power develops emissions-compliant performance parts for diesel and gas trucks, SUVs, and tow rigs—focused on airflow, efficiency, and reliable power. With decades of engineering and patented development, Banks offers systems like intakes, exhaust and boost upgrades, tuners, and supporting components designed to increase performance while maintaining drivability for real-world use.