Tuner DT1120010101009 Switch on the Fly Tune incl EFI Live Spade | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

DuramaxTuner SOTF Custom Tuning with EFI Live Spade | 2004.5–2005 GM 6.6L Duramax LLY

Unlock Your Truck's Full Potential — Switch Power Levels Instantly On the Road

This DuramaxTuner Switch-On-The-Fly (SOTF) Custom Tuning Kit with EFI Live Spade gives your 2004.5–2005 Duramax LLY unmatched flexibility, power, and driveability — all while keeping your emissions equipment intact. Whether you tow, commute, or race, this kit includes five fully custom tunes that can be shifted between in real time, eliminating the need to reflash or use handheld programmers. Enjoy responsive performance, smarter EGT control, and cleaner emissions with 14+ years of custom tuning expertise behind every calibration.

Tune Profiles Included:

Sport Tune

• +135 RWHP / +243 ft-lbs

• Maximum performance and throttle response

• Firm shifting, no throttle lag

• Best used with gauges; not for towing

Street Tune

• +110 RWHP / +198 ft-lbs

• OEM reliability with serious power gains

• Crisp acceleration, smooth power curve

• Ideal for spirited daily driving

Light Tow

• +55 RWHP / +99 ft-lbs

• Designed for towing loads under 8,000 lbs

• EGT-controlled with air-fuel ratio safety limits

• Smart throttle response and turbo-brake support

Heavy Tow

• +40 RWHP / +72 ft-lbs

• Ideal for towing heavy loads up to GVWR

• Maintains lower EGTs with refined torque curve

• Back up trailers smoothly without lurching

Optimized Stock

• OEM feel with slight improvements

• Great for troubleshooting or lending your truck

• Maintains factory drivability with no extra power

Kit Includes:

• EFI Live AutoCal V3 (SPADE) Device

  • OBDII flash tool for diagnostics and tuning

  • Scan and datalog functions included

  • Stores multiple custom tune files

  • EFI Live license included

Recommended Upgrade: TCM Transmission Tuning

Pair your ECM tuning with optional TCM tuning for:

• Sharper, more precise shifting

• Optimized torque converter lock-up

• Greater clutch holding power

• Smoother acceleration and safer towing

TCM tuning is highly recommended if you’ve installed:

• Larger tires (35"+)

• Built transmission

• Modified turbos

• Or done extensive ECM tuning

Fitment

2004.5–2005 GM Silverado 2500HD / 3500HD & Sierra 2500HD / 3500HD 6.6L Duramax LLY

Compliance

• Emissions Intact – No need to delete emissions equipment

• Not for sale or use in California