A company named Spintech makes mufflers that are only 2.25 or 2.5 inches thick. They are otherwise shaped like a normal muffler. They also make oval shaped tubing. They mainly supply the street rod industry, and make these designs for applications like you'd have - with limited ground clearance.
Flowmaster also has a new muffler that is smaller, and is billed as having a retro sound. If you haven't visited Flowmasters web site, you should do it just for fun. They have great sound samples to listen to. It's great entertainment for a car nut!
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