Matt,
The N/A ZX exited on the right side and the Turbos exited on the left side. You can either change the rear valance or cut out another curve for the muffler tip on the left side. However, if you do that then you will have two exit points. If you can get your hands on a turbo rear valance it would look a lot cleaner, more work involved, but if your not worried about having two openings then just cut the left side.
Good luck,