Sure looks like you can still buy the parts new.
Honda Automotive Parts
The VX does have a smaller exhaust then the other civics, if someone made a civic header that was sized for a 1.5L engine running at 1,500RPM then I would buy it, but race headers only hurt your gas mileage and put more stress on your engine, if you do a back pressure test (gauge threads in to your o2 sensor port) you would see that larger is not better and that with a properly sized exhaust you see very little if any back pressure, back pressure is a myth used by ricers to excuse their poor choices.