Vespas have been popular in Indonesia since the 1970s, but one group of enthusiasts have been hitting the road with modified versions of the classic Italian scooters. Their passion has created an entire culture known as Vespa Extreme, attracting thousands of self-taught craftsmen who turn their rides into unique vehicles using creative designs ranging from the practical to the outrageous. Regional meetups can draw as many as 50,000 enthusiasts, all trying to outdo each other. The competitive…