I used to have a poorly done custom dual setup that I hastily slapped together. I also favored the dual muffler / quad pipe look of a Mitsu 3000gt or 300zx, but this system proved to be incredibly inadequate. The left bottom of the Prelude doesn't accommodate an exhaust line like the right side, so you would either have to make an h pipe or make the left pipe lower than the right.
Making the left pipe lower, or both of them lower, seriously puts you at a risk of scratching the pipes. And the h pipe idea (which I did) does not evenly distribute exhaust flow. Maybe if you can figure out a nice clean way of doing it, it would look great. But otherwise, I wouldn't suggest dual muffler exhaust on an inline engine.