MJ Diesel Speed Shop

Medium Duty Diesel Truck Specialists

Certified Technicians

Our technicians are certified to rebuild, replace, repair and upgrade all medium duty diesel engines including Cummins, Powerstroke and Duramax.

Diesel Performance Specialists

Whether you have a Ford, Chevy or Dodge medium duty truck, we can improve the performance of your vehicle with adding a turbo or a transmission upgrade.

Caffeine & Octane

North America’s Largest Monthly Car Show

MJ Diesel has been part of the Caffeine & Octane monthly car show since 2019 and continues to help promote and be an integral part of its’ success.  Every month, 2,500+ cars and 15,000+ fans attend the show.  The show is free to attend and free to exhibit.  Visit our spot once the show opens back up in the coming months.

Caffeine and Octane is held the first Sunday morning of each month at Perimeter mall in Dunwoody, GA, just north of Atlanta.

The next Caffeine and Octane is Sunday, Sept. 6 from 8 to 11:30 AM at Perimeter Mall, Dunwoody, GA.

We will be bringing two new projects to the show! We’re so excited to reveal our Argosy Rehab Project for Caffeine and Octane along with our LML Duramax Street Performance truck.

Recent Media

Social Distancing Car Show

May 16th Virtual Caffeine & Octane live from the Garage.

MJ Diesel Blog

Latest News & Updates