About us- Why buy from us?

• We have over 400 resellers in North America to better serve you
• Best aftersale support in the market with 15 employees
• All our tuning are made in house and Dyno tested
• We offer tuning on more brands and models than any other competitors.
• We are #1 tuning shop in North America since 1987! Over 50 000 trucks tuned!

Diesel Spec Inc. is the leader in truck diesel engine ECM tuning technology

With over 50,000 medium and heavy-duty diesel truck 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 400 dealer locations in North America. We are growing with dealers in United States and Canada. We can serve you, no matter wherever you may be!

Diesel Spec specializes in fuel efficiency and performance tuning 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 diesel engine tuning for :

Cummins, Caterpillar, Detroit Diesel, Mercedes, Isuzu, International Maxxforce, Paccar, and most agriculture engines.

Established in 1987 and with over 31 years of experience in heavy duty diesel engine, Diesel Spec Inc. is the best choice for all your heavy duty truck engine and performance needs.

Diesel Spec continue to be innovative, each day, to keep our customers satisfied by offering them the best quality service possible and the latest technologies.

We are specialized in the following engines :

Contact us

Meet our amazing Diesel Spec Inc Team