Cobb has manufactured and sold over 81,000 tuners for gas-powered vehicles to disable emissions controls or alter engine performance. The tuner also sold over 8,400 exhaust pipe upgrades that fall foul of the Clean Air Act.

Cobb Tuning and the EPA have reached a settlement related to the brand's tuners and software.

The EPA called out Cobb’s sale of “defeat devices” that allowed buyers to bypass some emissions restrictions on their cars in a lawsuit back in 2022.