How do you make flame throwers longer?

Question

ive seen some videos with flamethrowers, but they werent very impressive (they went like maybe 5 feet)

But how do they get to be like this:

http://vids.myspace.com/index.cfm?fuseaction=vids.individual&VideoID=39494037

Answer 1

What kind of backwater third world community do you live in that you need to make a flame thrower?  

Are you that bored living in your hick settlement!? Or are you planning to attack an embassy somewhere?

Answer 2

Extend your barrel and use a highly flammable substrance. Research what gives you the most force and there you go

Answer 3

Pump up the pressure in the fuel container.

(In the video, the flames WERE NOT coming from the car engine. A high pressure container of fuel or a real flame thrower or two were probably hidden under the car.