Optimized Stock Tune Only for EFI Live Spade

Features:

• 49 State Legal emissions compliant
• Emissions equipment remains fully intact
• Optimized factory calibration refinement
• No significant peak power increase
• Lower smoke output than stock
• Ideal for troubleshooting drivability issues
• Great for new tuned truck owners
• Compatible with intake requiring tuning
• Allows custom tire size adjustments
• Retains factory turbo brake function
• Requires EFI Live AutoCal V3
• Supports professional transmission tuning

Refine Your 2015 Duramax Without Adding Unnecessary Power

Not every upgrade has to be about chasing bigger numbers, and that is exactly where this Optimized Stock Tune for your 2015 Silverado or Sierra 2500HD or 3500HD LML shines. This calibration keeps peak power levels close to factory while cleaning up drivability and reducing smoke output. If you recently added a cold air intake or minor upgrade that requires tuning but you are not looking for more horsepower, this file fits perfectly. It is also a smart option when someone else needs to drive your truck and you want a smooth, predictable setup loaded. Many owners use this tune for troubleshooting since it slightly refines factory mapping without dramatically changing performance. You can still tow with it, though it will not deliver the added torque of the dedicated tow files. With emissions equipment remaining fully intact and 49 State Legal compliance, you gain subtle refinement while keeping everything compliant and reliable.

Carefully Revised Factory Calibration With EFI Live Control

Under the hood, this Optimized Stock Tune features slight but intentional revisions to factory calibration tables. Throttle mapping, fueling adjustments, and overall refinement are addressed to improve responsiveness and reduce unnecessary smoke. The tune requires the EFI Live AutoCal V3, also known as the SPADE device, which allows simple OBD flashing and professional level data logging. It also gives you the ability to adjust tire size settings to correct speedometer and TPMS behavior after wheel and tire changes. There is no wire splicing or sensor tampering involved, keeping the process clean and factory friendly. For trucks that already have ECM tuning or larger tires, pairing this file with recommended TCM tuning can further improve shift quality and torque converter behavior. The result is a 6.6L LML that feels smoother, more refined, and properly calibrated without pushing beyond factory power levels.

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

Notes:

• Fits 2015 GM 6.6L Duramax LML only
• No significant peak power increase
• Designed for refined stock performance
• Emissions equipment must remain installed
• 49 State Legal emissions compliant
• Requires EFI Live AutoCal V3 device
• Additional license needed for other trucks
• Useful for troubleshooting drivability concerns
• Allows tire size calibration adjustments
• Transmission tuning recommended for best results
• Can tow but no added tow power
• California Proposition 65 warning applies