Can this sub be wired to 2 ohms?

Yes. The dual 4-ohm voice coils can be wired in parallel for a 2-ohm load or in series for 8 ohms. Match that to what your amplifier is stable at.

What size enclosure does an 8-inch sub need?

It needs a box built for an 8-inch driver with the airspace the manufacturer specifies for sealed or ported use. A box that is too small or too large hurts output and sound quality.

How much amplifier power does it need?

It is rated at 750 watts RMS, so an amp that delivers roughly that into your chosen impedance gets the most from it. A weaker amp will still work but limits output.

Is an 8-inch sub enough for a car?

For most cars, yes, if you want tighter, musical bass in a small space. If you want heavy deep bass, a 10 or 12-inch sub moves more air.

What is a non-pressed paper cone?

It is a paper cone that is not compressed during manufacturing, which many listeners find gives a warmer, more natural sound. It is less rigid than some synthetic materials.