here is one way of boasting the stock heater on a bug. i got this way out of a hot vws mag a year or so ago. all you need is 2 bilge blowers avalible for most boat places for about $50-65 each. you then cut the housing from under the back seat and make some adaptor rings to taper it down to the housings like such.
heres a comparison between the stock and the modified
bear in mind they are no longer than stock but are missing the tension that holds them together
“We all pay for life with death, so everything in between should be free.” Bill Hicks
the chaos project - click me