Building a heater into rear defroster blower hose

2nd gen RX-7's had an electric heater (I think) my friend had one in WA state and it kicked *** instantly on a cold morning. That how he described it (they also had really cool spare tire rims!) Maybe find one and adapt its heating element?

how 'bout something like this hardwired? http://www.google.com/products/cata...=X&ei=wyH1Tv-cF6rciAKeov2wDg&ved=0CIsBEPMCMAA