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Diesel Truck Performance Parts

    Customer Reviews
  • 5 Star Rating
    This was the greatest investment I ever put into my truck. Amazing. And the price was even more amazing!
    – Greg Smith, MI
  • 5 Star Rating
    Superb product. Amazing returns and results. And the cost is a No Brainer!
    – Robert Cortez, IN
  • 5 Star Rating
    The only thing I regret is not installing my harness SOONER! Thank you Diesel Freak! You guys made a great product.
    – Jeff Morse, FL
  • 5 Star Rating
    I was skeptical, but for the price I was willing to try it. Boy am I glad I did! Diesel Freak really delivered. Fuel savings alone paid for the harness within the first 2 days!
    – Chad Brant, TX

More PowerMore Power

Up to 90 HP Increase & 250 FT LBS Torque Increase Increase HP and FT LBS

The best set of power harnesses on the market. Control fuel rate at your finger tips. Built and tested by a CAT master mechanic. Dyno results from 10 different trucks show increases in horsepower around 90 HP and torque around 250 ft. lbs. Increases in fuel mileage have been from .5 mpg to as high as 2 mpg depending on application. 1 year warranty and all are made in the USA. 100% money back guarantee.

Fuel EfficencyFuel Efficency

Literally save thousands of dollars on fuel by increasing your fuel efficeincy.

Save fuel and let your engine run better! Built and tested by a CAT Master Mechanic. Tested for two years before being sold to the public. Many have imitated but never duplicated the Diesel Freak brand harnesses. Increases in fuel mileage have been from .5 mpg to as high as 2 mpg depending on application. These harnesses were built for one thing, to increase fuel mileage. They can save you thousands of dollars in fuel costs. 1 year warranty and are made in the USA. 100% money back guarantee.

Does Not Voide WarrantySafe on your warranty


  • GET MORE TORQUE
  • INCREASE FUEL EFFICIENCY
  • CRISP THROTTLE RESPONSE
  • VIRTUALLY ELIMINATE LAG
  • INCREASE LONGEVITY OF YOUR MOTOR
  • 1 YEAR WARRANTY
  • 60 DAY MONEY BACK GURANTEE
  • Does NOT void Factory Warranty!