Heavy Tow Tune incl EFI Live Spade

Features:

• Safe for towing heavy loads
• Includes EFI Live Spade AutoCal V3
• Boosts power by 40 HP, 72 ft-lbs
• Emissions intact, no deletes required
• SMART EGT control for cooler temps
• Air-fuel ratio tuning reduces soot
• Designed to tow up to 8,000 lbs
• Improved low-speed trailer control
• Revised pedal response for better driveability
• No wiring or sensor hacking needed
• Simple plug-in OBD programming
• Includes EFILive license and updates

Unlock The Confidence To Tow What You Want

If you’re towing serious weight with your 2015 Silverado or Sierra HD, you need more than just stock power, you need dependable torque, cooler temps, and smarter shifting. The Heavy Tow Tune from DuramaxTuner.com gives you exactly that, increasing output by +40 rear-wheel horsepower and +72 ft-lbs of torque, without pushing your engine into dangerous territory. This isn’t just about speed; it’s about control. Backing up a heavy trailer becomes smoother, low-speed maneuvering gets easier, and climbing hills with a full load feels less like a struggle. The built-in SMART EGT control keeps exhaust temps in check, giving you more confidence when towing long distances or hauling through steep grades. It’s emissions intact and 49-state legal, so you don’t have to touch your emissions equipment to get noticeable performance. Whether you're pulling a skid steer to the jobsite or towing a fifth wheel across the state, this tune helps you shift up, throttle back, and get there with less strain on your truck.

Built For Heavy Loads And Smarter Performance

This custom tune is specifically calibrated for the 2015 GM 2500HD and 3500HD Duramax LML and was designed from the ground up to support trucks pulling 8,000 pounds or more. It uses more than 100 custom calibration changes to deliver stronger, cleaner power without compromising drivability or reliability. Built-in air-fuel ratio limits help reduce soot production, and factory turbo brake functionality is fully retained for controlled downhill towing. The included EFI Live Spade (AutoCal V3) makes installation simple with plug-in OBD functionality and no need to tap into sensors or control units. You also get access to scan and log engine data for diagnostic use, plus the ability to flash unlimited tune updates for your truck. This package includes the required EFILive license and gives you the option to add transmission tuning for even better torque management and clutch control. Together, it helps your truck stay in the right gear longer, pull harder in the midrange, and keep the power where it matters most when the weight starts working against you.

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

Notes:

• Includes EFI Live Spade AutoCal V3 hardware
• EFILive license is included in the purchase
• Emissions equipment must remain installed
• 49-state legal, not approved for use in California
• Designed for trucks towing 8,000 lbs or more
• Not intended for deleted or heavily modified trucks
• Recommended for trucks with stock or lightly modified setups
• Transmission tuning is strongly recommended for best results
• Custom tune is preloaded for your specific truck
• Simple plug-in installation using OBD-II port
• Can be updated or reflashed with future tune revisions
• Individual tune and license required for each additional truck