Heavy Tow Tune Only for EFI Live Spade

Features:

• Safe for towing up to 8,000 lbs GVW
• 50-state legal with emissions equipment intact
• Improves towing power without raising EGTs
• Boosts torque by 72 ft-lbs and 40 HP
• Custom SMART EGT and air-fuel control
• Factory turbo brake retains full function
• Smoother throttle and low-speed trailer handling
• No cutting or splicing into factory wiring
• SPADE AutoCal v3 included with EFILive license
• Great for towing heavy loads through tough terrain
• Ideal for service, tow, or construction trucks
• Recommended TCM tuning for smoother shifting

This Is The Tune That Makes Heavy Towing Feel Easy

If you rely on your 2014 Duramax to handle serious weight, this Heavy Tow Tune is the upgrade you didn’t know you needed. It’s built for those who tow on the regular and can’t afford to sacrifice performance, reliability, or drivability. Whether you're pulling a heavy trailer, a loaded-down work rig, or hauling through mountain grades, this tune gives you the confidence to get moving and stay in control. It adds 40 rear-wheel horsepower and 72 ft-lbs of torque, giving you that extra shove without raising EGTs. Throttle response is smoother, trailer maneuvering feels more natural, and you’ll finally feel like your truck is doing the work instead of you. This tune is completely emissions intact, meaning you stay 50-state legal while still getting real-world gains. With support for factory turbo braking and built-in safeguards for towing, it’s ideal for anyone putting in serious mileage under load. It’s reliable, efficient, and exactly what a heavy-duty towing setup should feel like.

Built To Deliver More Power Without Compromising Safety

This Heavy Tow Tune is more than a bump in numbers, it's a carefully engineered calibration built to enhance towing performance while protecting your engine and emissions system. With over 100 calibration changes from stock, it redefines how your truck responds under load. The tune keeps emissions equipment intact and fully operational, and it limits soot production with smart air-fuel ratio management. Custom SMART EGT Control automatically monitors exhaust temps, helping prevent overheating when hauling uphill or through tough terrain. Revised pedal sensitivity offers better low-speed control, and the powerband is reshaped to keep your engine right where it needs to be. Plus, it retains full factory turbo brake functionality for maximum control on descents. It’s also designed to work seamlessly with the EFILive SPADE Autocal v3, giving you the tools to flash your tune, monitor performance, and log diagnostics with ease. If you're running larger tires or custom ECM tuning, adding TCM tuning is highly recommended to complete the package and unlock the best possible drivability.

Fitment: 2014 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Notes:

• Designed for towing up to 8,000 lbs GVW.
• Emissions equipment stays intact for 50-state legality.
• Ideal for drivers towing frequently or long distances.
• Not optimized for fuel mileage when towing light loads.
• Improves towing response without raising EGTs.
• Recommended for use with supporting transmission tuning.
• TCM tuning strongly advised for trucks with mods or big tires.
• Includes SPADE EFILive AutoCal V3 device and license.
• Requires additional EFILive license for multiple trucks.
• Supports full factory turbo brake functionality.
• Best paired with other tunes in a Switch on the Fly pack.
• Calibrated for smooth low-speed trailer maneuvering.