Dual exhaust

Does having a dual exhaust enhance performance in any way? Has anyone had this done to their Tercel?

it is not possible to have "real dual exhaust" on a 4 cylender. Because you only have one manifold. You could split the pipe after it and have two pipes all the way back. But you would actuly loose power because there would not be enough back pressure. So stick with the on pipe, and not to metion that it would be very hard customizing that pipe under the car to fit and bend over every thing.