Oval.
I do have to be careful with ground clearence when I back the car off the trailer with the short 20" racing slicks to avoid catching the muffler on one of the cross braces, and if I had to do it over I think the round muffler would fit better in the recessed area just past the shift linkage.
Probably not an issue with DOT tires and the IT 5" ride height rule though...
I have no experience wih one of these, but if you have room for a side exit or have a long pipe with a rear exit, then one of these might be a good choice too:
http://www.borla.com/products/produc...ullet+Mufflers
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