Thanks for the reply Terry. I'd love to see the ad if you ever run across it. I'm really just intrigued that he actually did them. He was primarily just a bicycle accessory manufacturer that jumped into the minibike game when they were hot like many others who were already in a similar manufacturing...

Like the title says, I'm trying to find out about these pipes. What were they originally meant for? Bill Matthews was a bicycle accessory company that did some minibikes in the early 60s, and from what I can figure out, the design was bought out by Steens somewhere between 1962 and 1965. There are b...