Dan,
Thanks for the complement! There are so many great ones on this site - many, IMHO, far better than my own.
Sam,
On the ERA it runs under the frame rails then over the rear axles and out the back. Ground clearance is a little tighter, but no problems so far - my
oil pan actually hangs a little lower than the exhaust. FWIW, the sound is loud enough to set off car alarms with a good blip of the throttle yet not too loud to need ear plugs while cruising.
Here is the ERA web page with some excellent photos of the underside and routing:
http://www.erareplicas.com/fia/exhaust.htm