Heavy Tow Tune Only for EFI Live Spade

Features:

• Fits 2012 6.6L Duramax LML
• 50 state legal emissions compliant
• Emissions equipment remains fully intact
• Designed for heavy towing applications
• Plus 40 RWHP and 72 lb ft
• Air fuel limits reduce soot
• Retains factory turbo brake function
• Improved low speed trailer control
• Over 100 calibration changes
• Optional second or third gear start
• Supports ZF6 manual transmission trucks
• Requires EFI Live AutoCal V3

Tow Harder With Confidence And Controlled Power

If your 2012 Silverado or Sierra 2500HD or 3500HD LML is built to work, this Heavy Tow Tune is designed to make those long pulls feel easier and more controlled. Instead of simply adding fuel, this calibration focuses on usable torque that helps get heavy trailers moving without pushing exhaust gas temperatures through the roof. With gains of plus 40 rear wheel horsepower and 72 lb ft of torque, you will notice stronger acceleration when merging onto highways or climbing steady grades. Additionally, built in air fuel ratio limits help reduce soot production, keeping your emissions system operating as intended. The revised pedal sensitivity improves low speed maneuvering, which is a major advantage when backing a trailer into tight spaces. Factory turbo brake functionality remains fully intact, so you still have the downhill control you rely on. For drivers who tow large boats, construction equipment, or heavy service bodies, this tune delivers strength where it matters most while staying 50 state legal.

Purpose Built Heavy Tow Calibration For The 2012 LML Platform

This Heavy Tow Tune is engineered specifically for the 2012 6.6L Duramax LML and requires the EFI Live AutoCal V3 device for flashing. The calibration includes more than 100 changes from stock, refining torque management, throttle mapping, and fuel delivery for sustained towing conditions. Designed for loads up to 8000 pounds gross vehicle weight, it helps keep the engine in its power band when lugging up hills or pulling through long inclines. Furthermore, the tuning strategy avoids wiring modifications and maintains full emissions compliance under E.O. D-845 guidelines. An optional second or third gear start can be configured for competition applications, adding flexibility for specialized use. The calibration is also developed to work effectively with ZF6 manual transmission trucks by optimizing throttle input for smoother shifts. For best drivability, transmission tuning is strongly recommended, especially on trucks running larger tires or additional performance upgrades.

Fitment: 2012 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Notes:

• Fits 2012 6.6L Duramax LML only
• 50 state legal with emissions intact
• Emissions equipment must remain installed
• EFI Live AutoCal V3 required
• Additional EFILive license may be required
• Designed primarily for heavy towing use
• Light Tow tune may improve MPG
• TCM tuning strongly recommended
• Supports ZF6 manual transmission applications
• California Prop 65 warning applies