I took delivery of the above vehicle two months ago. Currently, I am
contemplating adding fog lights, rear splash guards, and the auto
day/night mirror to the car. A few questions exist in my mind:

1) Should I purchase these parts online and have them installed by a
dealer? If so, what's a good place to buy online?

2) How much should I expect the dealers to charge for these parts
including installation?

3) Are these parts self-installable? Will it void any warranties?

Thanks.