Cummins Custom GT Tuner - Professional Handheld Performance Programming

PROFESSIONAL CUSTOM TUNING IN A HANDHELD DEVICE

Heavy Diesel Tuner's Bully Dog GT Custom Tuner is compatible with:

2007 - 2023 All Cummins engines equipped with CM2150, CM2250, CM2350 & CM2450 ECMs.

ISB 6.7L, ISC 8.3L, ISL 8.9L, ISL9, ISM 10.8L, ISX, and X15

This tuning package comes with everything needed to tune and mount the monitor in your truck.

Custom Power Programmer cost is $1899.00 and includes 2nd day shipping. (USA Only)

This tuner does NOT effect regeneration or emissions systems it is for POWER AND FUEL ECONOMY INCREASE ONLY and is NOT compatible with previously tuned or deleted trucks!

This isn't a generic off-the-shelf tuner—it's a professional-grade Bully Dog GT handheld with custom tuning files engineered specifically for your Cummins engine. Each tune is built from the ground up for your engine using OE software as a foundation, ensuring all accessory settings and functions work exactly as they should. Unlike typical "one size fits all" box tuners that promise a flat X% power gain, we deliver more reliable power increases and better fuel economy gains than anyone else in the industry.

After installing your tune file, the GT tuner stays plugged in so you can monitor engine parameters in real time, switch between tunes on the fly, or return to stock whenever you need to. It's the perfect combination of professional custom tuning and convenient handheld technology.

PROVEN BENEFITS THAT DELIVER REAL RESULTS

Substantial Power Gains

Experience significant horsepower and torque increases that transform your truck's performance. Our custom tuning optimizes your entire power curve for improved throttle response and pulling power across the RPM range, whether merging onto highways, climbing steep grades, or pulling heavy trailers.

Improved Fuel Economy

Save money with optimized tuning that maximizes combustion efficiency. By optimizing fuel delivery, injection timing, and boost pressure, you'll achieve noticeable fuel economy improvements. We generally see 0.8-1.2 MPG gains after tuning—savings that quickly add up for owner-operators and fleet managers.

Real-Time Engine Monitoring

The Bully Dog GT tuner displays real-time engine parameters including boost pressure, exhaust gas temperature (EGT), engine coolant temperature, transmission temperature, and many more critical parameters. Monitor your engine's vital signs and catch potential issues before they become expensive problems.

Application-Specific Calibration

Every custom tune is calibrated for your specific engine model and ECM type. Our tuning files are developed through extensive testing and real-world validation to deliver optimal performance while maintaining safe operating parameters and engine longevity.

Return to Stock Capability

The GT tuner stores your original factory tune and lets you flash back to stock anytime—valuable for warranty service, inspections, or resale.

COMPATIBLE ENGINES

Works for Class 8 heavy-duty trucks, medium-duty commercial vehicles, motorhomes and RVs with Cummins power, and vocational vehicles.

Not sure if your engine is compatible? Contact our technical support team with your vehicle's VIN or engine serial number for verification.

100% SATISFACTION GUARANTEE

We're confident you'll love the performance improvements from our custom-programmed GT tuner. If you're not satisfied with the results, contact us and we'll make it right.

Your GT tuner purchase includes direct access to our technical support team of experienced diesel technicians who know Cummins engines inside and out.

Support Hours: Monday-Friday, 9am-5pm EST
Phone: 1-423-709-7755
Email: info@heavydieseltuner.com

FREQUENTLY ASKED QUESTIONS

Q: How difficult is the tuning process?
A: Very simple. The Bully Dog GT tuner comes with detailed instructions and an intuitive interface. If you can connect a device to your truck's OBD port and follow on-screen prompts, you can flash the tune. The process takes about one hour.

Q: Will this void my engine warranty?
A: Custom tuning may affect warranty coverage. We recommend reviewing your warranty terms. The GT tuner allows you to return to stock programming if needed for warranty service.

Q: Is custom tuning safe for my engine?
A: Our custom tunes are developed through extensive testing and designed to operate within safe parameters that protect engine longevity while delivering impressive performance gains.

Q: Can I return my truck to stock programming?
A: Yes. The GT tuner automatically backs up your factory tune before flashing the custom tune. You can return to stock programming anytime through the GT tuner's menu.

DON'T WAIT - UNLOCK YOUR ENGINE'S POTENTIAL TODAY

Every day you drive with factory programming, you're leaving performance on the table. Our custom-programmed Bully Dog GT tuner delivers results every time you turn the key.

Heavy Diesel Tuner is not affiliated with Cummins Inc. or Bully Dog. Cummins, ISX, ISL, ISB, and X15 are registered trademarks of Cummins Inc. Bully Dog is a registered trademark of Derive Systems. Custom tuning may not be legal for use on public roads in all areas. Check your local regulations. Use responsibly and in compliance with all applicable laws.

*PLEASE NOTE*

This tuning system DOES NOT effect or remove emission codes or allow for component removal and IS NOT COMPATIBLE with trucks that are already modified!