About us

Diesel Spec Inc. is the leader in ECM tuning technology for agricultural equipment and heavy trucks diesel engines. With over 25,000 tuning performed, Diesel Spec has built its reputation with countless satisfied customers all over the world.

If you are looking to improve fuel economy and/or increase the power of your current engine, we are confident that our expertise can help you achieve these goals. We offer a 30 Day satisfaction money back guarantee on all our tuning.

Diesel Spec has over 350 dealer locations in North America. We are growing with dealers now in Australia, New Zealand, Mexico, France, Austria, Chili and even South Africa. We can serve you, no matter wherever you may be, all around the world.

Diesel Spec specializes in fuel efficiency and performance tuning of heavy duty trucks and agricultural machineries diesel engines for owner/operators and fleets alike. Our high performance tuning designed for drag racing and off road competition may require EGR valve delete, DPF delete (Diesel Particular Filter) and/or Urea deletion kits. These changes would make for a winning upgrade.

 We offer tuning for:

John Deere, New Holland , Case, Massey Fergeson, Challenger, Class, Fendt, Valtra, Caterpillar , Volvo and many other Brands.

Established in 1987 and with over 27 years of experience in heavy duty diesel engine, Diesel Spec Inc. is the best choice for all your heavy duty truck and Agriculture engine and performance needs.