New Car = Must Mod?

[Brighton]

Hey All!

I just picked up an 07 yaris hatch (Auto w/93K on it) as my new commuter. The cars fully stock and I've only driven it a few days so far and already want to change things about it. It's going to stay as a daily driver so I don't plan to go extreme with any mods. I'm sure I can find some of this info around if I dig for it so feel free to ignore any of the questions

BUT I've never messed with Yaris' so I wanted to get some info.
1. Are there other OEM seats that bolt into place of the factory Yaris ones? (IE from a corolla or something)

2.Has anyone put in one of the Joying headunits? And if so, did it suck?

3.What's the max tire size you can do without rubbing on anything? I was thinking of going to 15x7 or 15x8

4.Has anyone installed the magnaflow full exhaust system?

5.Do some of the cars come with cruise control and if so does it need anything other than the cruise control steering wheel to add that option to the car? (GMs do this which is why I ask)

Here's the car in case you care to see it haha

photo4992250675706570814.jpg