Can I still upgrade a BMW 118i 2007?

[joethomas]

Hi! I'm "inheriting" my brother's BMW 118i 2007, and I'm wondering if I can do the following upgrades to it without ruining the car:

1. Add touchscreen infotainment system
2. Add parking sensors (front and rear)
3. Add a push start button

Your expertise would be highly appreciated, gents! Thanks!