Heavy Tow Tune Only for EFI Live Spade

Features:

• Fits 2015 6.6L Duramax LML
• 49 state legal emissions compliant
• Emissions equipment remains fully intact
• Designed for heavy towing applications
• SMART EGT control manages temperatures
• Air fuel limits reduce soot
• Plus 40 RWHP and 72 lb ft
• Retains factory turbo brake function
• Improved low speed trailer control
• Smoother throttle and pedal sensitivity
• Over 100 calibration changes
• Requires EFI Live AutoCal V3

Built For The Guys Who Tow Hard And Tow Often

If your 2015 Silverado or Sierra 2500HD or 3500HD spends more time hooked to a trailer than cruising empty, this Heavy Tow Tune was built with you in mind. Instead of chasing peak numbers, this calibration focuses on usable power that makes hauling feel easier and more controlled. You gain up to plus 40 rear wheel horsepower and 72 lb ft of torque, which helps get heavy trailers moving without excessive throttle input. Additionally, SMART EGT control actively manages exhaust gas temperatures so you can pull long grades with confidence. The revised pedal sensitivity makes low speed maneuvering smoother, which is a huge advantage when backing into tight job sites or lining up a gooseneck. Factory turbo brake functionality is fully retained, giving you added control on downhill stretches. For drivers who tow through hills, mountains, or rack up serious miles each year, this tune delivers strength where it counts most.

Emissions Compliant Heavy Tow Calibration With Advanced Control Strategies

This Heavy Tow Tune is engineered specifically for the 2015 6.6L Duramax LML and remains 49 state legal with all emissions equipment intact. The calibration includes more than 100 changes from stock, carefully adjusting torque management, fuel delivery, and throttle mapping to support sustained load conditions. Built in air fuel ratio limits help control soot production while maintaining reliable combustion under heavy demand. Furthermore, SMART EGT control continuously monitors and manages exhaust gas temperatures to help protect critical engine components during extended towing. The tune is designed for trailers from 8000 pounds up to gross vehicle weight, making it ideal for work trucks, tow rigs, and heavy service applications. An EFI Live AutoCal V3 device is required for flashing, and TCM tuning is strongly recommended to optimize shift timing and torque converter lockup. When paired with proper supporting modifications and monitoring, this Heavy Tow Tune provides a balanced and dependable approach to high load performance.

Fitment: 2015 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Notes:

• Fits 2015 6.6L Duramax LML only
• 49 state legal emissions compliant
• Emissions equipment must remain installed
• Designed primarily for heavy towing use
• EFI Live AutoCal V3 required
• Additional EFILive license may be required
• TCM tuning strongly recommended
• Best for trucks towing 8000 lbs or more
• Light Tow tune offers better MPG
• California Prop 65 warning applies