I have 00 Volvo V40

All Volvo S/V40 have a double-DIN opening.

So it will be an easy install.

Take out the volvo head unit and replace it with an aftermarket head unit and the empeg of course.

You don't need a faceplate.
The only thing you will need is a harness adaptors to connect the original equipment wiring harness to the after market ISO wiring loom.