One run we saw -- maybe a bunch of 'em -- the push truck was a retired semi tractor that had been converted/repowered for drag racing. A pair of stacks straight up out of the hood, some nitrous, and massive amounts of black smoke. The pilot of the push truck would get the nod from Jim Jenkins (or whomever) and simply stand on it. Couple that smoke with the cloud from the Phoenix per se -- and sometimes it was a minute or two before folks at the line could see the receding green truck.
Wow, it was great. Glad we got to see it. We even met up with the Phoenix team in Smith's store a few times -- when they'd be in there buying food for the crew. Nice folks there, too -- and ALWAYS wearing green t-shirts.