Just Got A yaris: Performance Mod Suggestion

[Marfulion]

Hi ppl, I am new here and I just got an 08 black yaris sedan, previously I had an 05 Rav4. Anyways this car is quite agile for being stock and decided to go ahead and go modding it. I am going to get the TRD shocks, springs and sway bar and wanted to know wat is the widest possible tire to get on the yaris without it sticking out of the fairing? i was thinking about 205s, they have the stock 185s right now with the potenzas. Also with the suspension hooked up and wider tires iam thinking an extra 50hp will wrap it up, what can i do to it to get about 50hp more out of it? and do u guys think the TRD suspension is good enough, thank you so much for suggestions if any.