I figured it had to something other than a 5.9L but I've seen some crazy stuff in my time.
It wouldn't have surprised me a bit to see the back half of a Cummins in the seat with you ;)
Around here they run pipes out the back of the bed or hood and smoke the place up.
They also sit at the bottom of a certain hill, and race up the thing.
I know, because I live on said hill.