[5] On July 16, 2020, it was announced that a three-hour TV special titled Diesel Brothers: Monster Jam Breaking World Records would premiere on August 8, 2020.
[6] In 2016, a Utah advocacy group called Utah Physicians for a Healthy Environment filed a civil lawsuit against the Diesel Brothers, alleging they engaged in "significant, repeated and ongoing violations of federal law" by modifying vehicles to create black smoke from the exhaust systems, which the group characterizes as "one of the most toxic types of pollution there is".
In June 2018, after hearing testimony from an emissions inspector based in Davis County, Utah that a Diesel Brothers truck had been illegally modified, a judge issued an injunction prohibiting any similar modifications in the future.
[10] The Diesel Brothers filed an appeal in April 2020, with their attorney arguing the case fell under a split circuit with contradictory Federal rulings.
[12] In 2021 the appeals court upheld the verdict and noted "flagrant misconduct" by the Diesel Brothers, but also ordered Shelby to re-calculate the fine to eliminate penalties associated with trucks or components which were sold outside Utah.