Hmm, I just used two stock photos, set them to Linear Light, and set them to a couple different opacity levels, then erased the rest of the image so only the flamethrower was there.
I also have a c4d at the end, too. That's how the flame like flips over on the end. Looks nice.
Thanks for the positive feedback. Always appreciated.
I'm on a different computer but I'll upload the stock photos to imageshack later.