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Lippy,
If I reall correctly, you are building a 427 ERA.
I put an under car exhaust, exiting before the rear wheel on my ERA FIA and really like the look, sound and no snake bites! I would do it again.
The muffler that fits & ERA recommended is the Dynomax #17762. It just fits between the frame outriggers, and the main frame rail & bodywork. Not sure if the frame setup is the same on the 427 ERA car. Best to check with Bob to see how much room there is. Also, if you are considering this option, be sure to let Peter know before they cut holes in the fenders for side pipes.
You will lose some horsepower compared to traditional 427 side pipes, which may or may not be a big deal for you. Also, if you go with the Jag rear suspension from ERA, you have the option of exhaust to the bumper should you want to try that.
Start with the under car setup, if you find you don't like it, you can always cut the fenders and go with side pipes.
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