You would have liked my job in the Air Force - jet engine mechanic. We used to fill 12"x12" ziploc bags with JP4, and toss them in the exhaust path of a J-79 on the open test cell. A really nice fireball and noise. Of course, civilians driving by on Las Vegas Blvd called it in one night, and the security police came by, allegedly to stop us. But we let them try it a couple times, and they went away happy... :)
Naughty, naughty. You didn't invite your friendly USAFR Captain El Gato over for the fun! For shame.
I would have thought you could have gotten the nearly same effect by just manipulating the throttle, into, out of and back in to burner. J-79 was loud enough all by itself. Two of them, equisit. However, if anything the old J-75 (F-105 and F-106) was even louder. When I was on active duty, I lived right under the approach path. When the local reserve unit's F-105s did a formation break type landing, one of them would come right over my house, low enough that I could see if the pilot's helmet visor was down or up.