In keeping up with the times, the King of the Street Challenge will switch to emissionscompliant competition in 2021. However, the original KOS competition will survive, with nothing changed whatsoever, but will now be called the All Truck Challenge. Essentially, what that means is that another class has been added and the same old, high-horsepower action will still be on display. Both classes will exist under the same umbrella, and KOS 2021 will still be held at Dragway 42 in West Salem, Ohio, this year from October 15-17.Source: http://www.smokeandspeed.com/