If you ain't rockin an 800+ CI juice motor, you might as well not even unload. I would say most of those cars are putting at least 1k all motor, and then putting enough zesty sauce through the motor to get every jugglo in the USA high.
http://www.sonnysracingengines.com/engines/pro-mod-903-cu-in-engine-over-2700hp-on-four-moderate-systems
http://www.sonnysracingengines.com/