UPDATE II: If you thought this was the only vehicle to be built in a muffler shape, think again. One Art Car website has pics of a variety of muffler-themed vehicles:

http://artcarcentral.com/muffler-mobiles-and-the-muffler-shops-that-made-them/

That site also had an additional photo of the yellow muffler mobile built on a CJ-2A body, which had been posted to Flickr:

From Flickr: https://www.flickr.com/photos/24609104@N06/4109925639/

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Originally posted September 03, 2012:  Like the Oscar Meyer Mobile (on a FC), this is built on a jeep platform (CJ-2A). This sold on eBay in 2012.

“The Mufflermobile! What is The Mufflermobile? It’s a fully-functional four wheel drive 1948 Willys Jeep CJ2A that’s licensed for the road. The body has been replaced with a custom made wood framed, aluminum skinned replica of a muffler that’s 8 feet high and 11 feet long. This is the most unique advertising vehicle since the Oscar Meyer Weinermobile!

Purchase The Mufflermobile, wrap it with your company’s advertising message, park it around town or show it off at different events, and people will come to your business just to tell you that they saw it! They’ll tell their friends about it; they’ll post pictures of it on facebook and twitter. They will promote your business for you! You can’t buy advertising like that! Oh wait, yes you can! Bid to win or Buy It Now!

The Mufflermobile is located in the Fredericton, NB area and is being sold as-is, where-is, no warranty expressed or implied. It is, after all, a 64 year old muffler.”