If you want to play with exas go to the LA north of New Oxford. Only big exas there (and a few small birds)
Where can i find New Oxford?
Go into a teleporter and click "change continent"
Very big exas on that LA...if you die you may not get out if you can't handle them. The revive is surrounded by Stalkers and Prowlers in all directions.
I've met a few stranded guys there who needed a hand to escape, it's not a busy place to be stuck.