I prefer my undercar exhaust, but I am a big fan of the street car setup. My car originally had sidepipes, and was switched over to under car exhaust using a pair of Flowmaster mufflers.
The layout is very straight foreward, with short downward facing block hugger headers which have a bend back and two pipes going back to a crossover pipe behind the transmission, then out to the mufflers.
It's not perfect, but was easy to fabricate and works pretty well.
It DOES affect ground clearance some, as the front edge of the mufflers are the lowest point on the car, but it's quite livable.
The original Cobra under car exhaust (which the vast majority of cars left the factory with) was a pretty complicated series of pipes going over the rear axles etc.
I also have very short legs, and the sidepipes just wouldn't do it for me.
