That X has a lot of custom components and is mostly stripped out.
Danny doesn't own the yellow race Xterra, it's owned by a guy named Dave here in Utah. He has been involved in off-road racing for decades. Almost nothing on that Xterra is off-the-shelf, as he built a lot of parts himself, including most of the suspension components.
If the OP doesn't mind being 2WD only, the Dirt King long-travel kits are the only off-the-shelf parts I know of made for an Xterra. You will need to source new coilovers as well. DIRT KING FABRICATION
Coupled with custom Alcans in the back and external reservoir shocks, it's a good start. The main issue in the back is getting enough shock travel for full droop and full bump. Cutting up a pickup bed to put in shock towers is less intimidating than cutting into the cargo area of the Xterra. Getting more travel in the back could also mean moving the spring perches and running longer springs.
My build thread > To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Get crazy and mount up a titan mid or long travel kit. Seen some frontier guys do it. most of the components should bolt right up. But would probably need custom coilovers, just like the dirt king option.