Hello people,
I'm new on the site, I hope all of you are enjoying your Rio's

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I'm located in Costa Rica and just finished the process to get my own car, they will deliver it by Dec and I can't wait to drive it.
I'm getting the Kia Rio Sedan, Auto, In graphite color, in CR this model only comes in 1.4L at 107hp (white and silver cars are way too common here)
Here's a picture of it (not taken here but its exactly the same)
To be honest this will be my first car so I know nothing of it yet.
This is what I currently drive until I get my car:

I love it but it's very impractical for some aspects, very useful in others..
So anyways, I had a couple of questions about the car:
1. I want to change the rims but I'm very unsure if I should go for 15's or 17's (17's look awesome but the streets in here might make them more prone to flat tires,) which ones could you recommend? I'm planning to get dark ones but still unsure.
2. A friend tells me I can get up to 30hp extra by changing the exhaust and the air intake. Is it true?
3. What actual benefit do I get from changing internal lights for LEDS and external for xenon?
4. Any ideas about some easy mods I can do?
I like how the car looks stock, but I want to add a little something so it will stand out from any other Rio's near, people here tend not to mod new cars (which I think is boring).
Greetings.