A bit off vehicle type but.....when I was a 2LT in a mech infantry unit (1/18 INF) we used to heat up our MRE's (meals ready to eat) by taking them out of the box, rolling up the foil packet and feeding up to six of them down the exhaust pipe of a M35 Duce. This was of course just running at idle, in about five minutes we would hit the throttle and blow all the MRE packs out (it really launches them!)....only problem was soot would cover the packs so you could not read the contents, so the Joe's would cut them open and the "you got mine, here's yours" would begin.