Diesel Smoke Units

hello everyone

I am currently kitbashing the Piko BR218 Diesel Loco and besides doing a superdetailing and new paint job I want to add a diesel Smoke generator with Fan. Where do you buy them and /or what have you used to create the same effect.?

Thanks for you help

Ross

The Aristo units are pretty good and only $22

http://www.ridgeroadstation.com/istar.asp?a=6&id=25529311!255

-Brian

its not the right color, that plume of thick black smoke that coats evrything around in a spray[:D]