Noob questions.

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I’m new here and I don’t even own a Yaris yet. But I am in the process of finding one I am happy with. Until I do I am trying to learn everything I can about the Yaris. So if you guys could help me get some things straight that would be much appreciated. So I am going to write out what I think I know and if I am wrong please correct me. No doubt you wouldn’t have any ways.
It has a 1.3 2NZ-FE engine that has about 84HP/6000rpm. It shares the same engine with a scion Xa and Xb. So does this mean most engine parts for the scion will bolt right up with the Yaris? It also shares the same suspension, correct? Again this means I can use parts from a scion?
ZPI seems to be the one leading with the most performance parts. Are there any other options out there? That is probably to broad of a question. What other companies make Yaris specific performance parts?

thanks in advance.