Duster Rear-Defroster/Defogger?

im thinking of a heating element that gets hot like a soldering iron and heats the air....i want it to look somewhat factory and be pretty small.

i would mount it inside a metal piece of pipe in between the blower and the rear defroster duct

now i need to find something that gets hot enough to make a difference and use dc power....about as much power as a grid defroster.....maybe a resistor would work...

2ohm 100watt resistor ...
running at 13.5volts ....dissipation would be 91watts....amps would be 7.....
wire to run it would be #14 or 12.
i think that could create enough heat to make the air warm....then with a variable switch i could raise and lower the voltage....a 75 watt bulb seems to make lots of heat and in a contained metal pipe it should be ok.

http://sunelectricheater.com/ .........and then there is this thing below....rated at 4 amps....its really small 1/8"....and can use any voltage it gets too hot though....1400°F