Heavy Tow Tune Only for EFI Live Spade

Features:

• Designed for towing up to 8,000 lbs
• 50 state legal emissions-intact tuning
• Increases power without raising EGTs
• +40 RWHP and +72 ft-lbs torque
• Improved throttle response and pedal feel
• Factory turbo brake remains fully functional
• Over 100 custom calibration changes
• Minimizes soot with optimized air-fuel ratio
• Ideal for hills, mountains, and heavy hauls
• Smooth low-speed trailer maneuvering
• No wire splicing or sensor hacking required
• SPADE AutoCal v3 device required

Built For Long Days And Heavy Loads

If your truck spends more time hooked to a trailer than cruising empty, this Heavy Tow Tune was built with you in mind. It adds usable power right where you need it, helping your Duramax pull confidently without feeling strained. You will notice how easily the truck gets moving from a stop, even with serious weight behind it. Throttle response feels more controlled, which makes climbing grades and merging into traffic far less stressful. Low speed maneuvering is smoother too, so backing a trailer into tight spots feels predictable instead of jerky. Best of all, it keeps your emissions equipment intact and legal, so you can tow hard and often without added headaches. This is the kind of tune you appreciate most after a long day when the truck still feels composed and capable.

Smart Calibration Focused On Safe Consistent Towing

Under the hood, this Heavy Tow Tune is carefully calibrated to support towing loads up to 8,000 lbs while keeping exhaust gas temperatures in check. Power gains of up to 40 RWHP and 72 ft-lbs are delivered through refined fuel and airflow strategies rather than aggressive shortcuts. Built in air fuel ratio limits help reduce soot while maintaining consistent combustion under load. Factory turbo brake functionality is fully retained, which is critical for downhill control when towing through hills and mountains. Pedal mapping is revised to provide smoother control at low speeds and steadier throttle input under sustained load. The tune includes over 100 custom calibration changes and avoids any wire splicing or sensor trickery. When paired with recommended transmission tuning, the drivetrain stays in its preferred rev range for better drivability and long term reliability.

Fitment: 2013 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Notes:

• 50 State Legal tune with E.O. No. D-845 included.
• Designed specifically for towing up to 8,000 lbs GVW.
• Not recommended for performance or competition use.
• SPADE / EFI Live AutoCal v3 device is required.
• EFiLive license is included if hardware is purchased from DuramaxTuner.
• Additional license required if reusing hardware from another vehicle.
• TCM tuning is strongly recommended for best drivability and shift quality.
• Works best when paired with transmission tuning for larger tires or turbo upgrades.
• Low-speed trailer maneuvering is improved with revised throttle mapping.
• Better suited for trucks that tow often or haul heavy service equipment.
• Emissions equipment must remain intact to stay legal and compliant.
• Optimized for durability, torque delivery, and lower exhaust temperatures under load.