Heavy Tow Tune Only for EFI Live Spade

Features:

• 50 state legal with EO# D-845
• Emissions intact, no deletes required
• Gain up to 40 RWHP and 72 ft-lbs
• Designed to tow up to 8,000 lbs
• Safe for long-distance and heavy towing
• Custom SMART EGT control manages temps
• Improved throttle response and pedal feel
• Factory turbo brake remains fully functional
• Smoother trailer backing and low-speed control
• Over 100 calibration changes from stock
• No wire splicing or sensor hacking required
• Built for stock or lightly modified trucks

Tow Heavy Without Stressing Your Truck Or Yourself

If your 2015 Duramax works hard and pulls serious weight, the Heavy Tow Tune from DuramaxTuner.com is built to make your job easier. Whether you're hauling equipment for work or towing a heavy trailer across the country, this tune delivers smoother performance, better throttle response, and just the right bump in power. You’ll gain up to 40 rear-wheel horsepower and 72 ft-lbs of torque, which helps you get up to speed quicker and stay there with less downshifting. It’s not just about raw numbers though, this tune gives your truck more confidence when climbing grades or maneuvering at low speeds with a loaded trailer. Revised pedal sensitivity makes backing up smoother and more predictable, while retaining your factory turbo brake ensures you stay in control on steep descents. Plus, it’s fully emissions intact and 50 state legal, so there’s no need to mess with your emissions system to get real, usable gains. For drivers who tow often and want their truck to feel more capable without compromising reliability, this tune is the perfect match.

Built Specifically To Support Heavy Duty Towing Needs

This Heavy Tow Tune was developed for the 2015 Silverado and Sierra 2500HD and 3500HD with the 6.6L Duramax LML and is calibrated to safely support loads up to 8,000 pounds GVW. It features over 100 custom tuning adjustments, offering a wider torque curve and refined pedal mapping for better drivability under load. SMART EGT control actively manages exhaust temperatures, while air-fuel ratio limits help keep soot output low, even when climbing hills or working the truck hard. Factory turbo braking remains fully functional, which is especially important when towing downhill with heavier trailers. The tune is loaded through EFI Live’s SPADE system using the AutoCal V3, a simple handheld tool that allows you to flash your truck, log data, and scan for diagnostic codes. No sensor tampering or wire splicing is required, keeping your installation clean and straightforward. For trucks with larger tires, upgraded turbos, or built transmissions, adding TCM tuning is highly recommended to maintain smooth shift points and keep the engine operating in its ideal power range.

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

Notes:

• This is a single custom tune, not a tune pack
• EFI Live SPADE AutoCal V3 hardware is required
• EFILive license is required if using existing hardware
• 50 state legal with CARB EO# D-845
• Emissions equipment must remain installed on the truck
• Designed for towing loads up to 8,000 pounds GVW
• Best suited for trucks that are stock or lightly modified
• Not intended for deleted or heavily modified vehicles
• Custom tune is preloaded specifically for your VIN
• Transmission (TCM) tuning is strongly recommended
• Supports data logging and diagnostics via EFI Live
• Ideal for trucks used in commercial or frequent heavy towing applications