Heavy Tow Tune Only for EFI Live Spade

Features:

• Gain up to +40 HP and +72 torque
• Safe for towing 8,000 lbs and up
• Emissions intact and 50-state legal
• Includes air to fuel ratio control
• Keeps exhaust gas temps safely managed
• Retains full factory turbo brake functionality
• Improves trailer response at low speeds
• Revised throttle pedal sensitivity while towing
• Custom tuning with 100+ ECM calibration changes
• No wiring mods or sensor hacking required
• Optimized for consistent performance on long hauls
• Recommended with TCM tuning for best results

Confidence And Control Every Time You Tow Heavy

If your 2011 Duramax spends its life hooked to a trailer, this Heavy Tow Tune was built for exactly how you use your truck. It delivers the right amount of extra power to get your load moving without pushing your temps or drivetrain too far. With improved throttle response and enough torque to “shift up and throttle back,” the truck feels more in control, especially when climbing grades or merging with traffic. Backing up a trailer is smoother too, thanks to revised pedal sensitivity that eliminates that frustrating lurching. You’ll keep full use of your factory turbo brake, so downhill towing feels just as safe and predictable. Whether you're pulling a fifth wheel, a skid steer, or a heavy service trailer, this tune helps your truck feel stronger and more capable without sacrificing long-term reliability. For anyone towing 8,000 pounds or more on a regular basis, this calibration makes the job easier, safer, and less stressful.

Smart Tuning Designed For Load Stability And Longevity

The Heavy Tow Tune for the 2011 6.6L Duramax LML is a purpose-built calibration that increases output by +40 rear-wheel horsepower and +72 ft-lbs of torque without raising exhaust gas temperatures. It uses carefully managed air-to-fuel ratio limits and other internal safeguards to reduce soot and maintain safe engine operation while towing heavy. Designed for emissions-equipped trucks, this tune is 50-state legal and retains full use of the factory turbo-braking system for added downhill control. It’s optimized for loads around 8,000 pounds GVW and above, making it ideal for construction trailers, work rigs, or serious over-the-road hauling. The calibration includes over 100 changes from stock, refining torque delivery, throttle response, and low-speed drivability without compromising the OEM safety systems. It’s especially effective when paired with TCM tuning to improve shift points and clutch performance, helping your transmission stay in the right gear longer under load. For owners using a ZF6 manual transmission, the tune is mapped for smooth throttle response to support clean gear changes without power spikes.

Fitment: 2011 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Notes:

• This is a single Heavy Tow Tune, not Switch on the Fly
• 50-state legal with E.O. Number D-845
• Emissions equipment must remain installed and operational
• Designed for safe towing of 8,000 lbs or more
• Not intended for deleted or off-road-only trucks
• Factory turbo braking feature is retained
• Air to fuel ratio limits help reduce soot and EGTs
• Gauges should be monitored while towing heavy
• Best results when paired with TCM transmission tuning
• Required for trucks with larger tires or driveline mods
• ZF6 manual calibration is throttle-mapped for smoother shifts
• SPADE / EFI Live AutoCal V3 device is required
• EFILive license included if purchasing hardware from us
• Existing devices require new license and auth code
• Custom tunes are non-refundable once delivered