Puerto Rico is not exactly a hotbed of metal activity. The only Puerto Rican band I have heard much material from so far is Sacrilegio, and I have only heard their side of a split with Mexican band Blood Exile. Nevertheless, Sacrilegio is a pretty impressive band. The speed/thrash metal band shows strong influences from Bay Area thrash metal bands with their own spin. Sacrilegio is a relatively new band but is one to watch.