Zv4's like small enclosures, so that works with your trunk space. 3.5 cubes, 50" of port area. An 8" aero is ideal. As for power, an SCV 3k would be my choice.
My daily driver has a NSv3-15 w/spl softies on a SCV 4k and our shop ride has a Zv5-15 w/spl softies on a SCV 3k.