Just a reminder that the 2021 running of the Ultimate Callout Challenge is still scheduled for May 21, 22, and 23. For three days, the baddest trucks in the world will gather at Lucas Oil Raceway in Indianapolis to compete for bragging rights, ultimate glory, and money. But on top of that, the Diesel Performance Industry (DPI) Expo will return-the premier diesel performance, aftermarket, and specialty products exposition in the world. For 2021, the DPI Expo is rumored to be 35-percent larger than the last one (2019). Single day passes, 3-day passes, and a Show ‘N Shine upgrade are all available for purchase online.