Through various sales, etc. I now have two plate carriers decked out with Ceramic/PE plates. One set is Level III and the other Level IV. From tests that I've seen the Level III that I have greatly exceed their ratings and will stop most 5.56 & 7.62 NATO rounds. The Level III is a pound or so lighter so I have that set in my Subaru. The Level IV is set up for home use with a pouch on the front that holds 3 x AR mags and 3 x pistol mags. Yeah, kind of overkill but if I never use it I'm not out a ton of money.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman