lol, had a similar experience in my bedroom with a peanut butter jar... had a 1/2" threaded copper fitting in the lid, thought with only about 3/4 of an inch of room above the water, it wouldn't do anything more than throw a little flame out the fitting, so i hit it with a lighter... end of the peanut butter jar.
i made a unit for my integra with 4" pvc, but can only drive with it on for about a half hour and it overheats. i had ss bolts goin thru the cap at the top and they got so hot they started melting down thru the pvc cap...
but i ran it for about a total of 100 miles out of 300 miles for the tank of gas, mileage went up from about 33 or 34 mpg to about 36, and it was a small unit. so if i could get the overheating problem fixed, i could probably get close to 40 mpg with my small unit.
your supposed to use either NaOH or KOH for an electrolyte, all i had was either table salt or baking soda, decided that baking soda was less corrosive so gave it a shot, maybe thats the source of my overheating, idk.