I don't really know that many specifics regarding engines, but if there's anybody out there that can enlightin me on my question, that'd be great.

What engine components would be the first to give out with 9-11 PSI & NOS on the engine?

I'm thinking that if they're some simple parts that maybe I could beef the specific components so that the engine could take more. Once again, I don't fully understand how the specifics of an engine works, so spare me the flaming of calling me a retard, and if you could answer the question then please do.
Thanks alot Cyclemut!