A6 project

Hi guys, so here I am, new to German cars in terms of mods, therefore I'm happy to get all the help and suggestions ppl are offering.

I have an A6 3.0 TFSI S Line exclusive ( yup it's a mouth full) and I live in Oman, it's a country in the Arab gulf.

I worked on a lot of Japanese cars but this will be my first German.

It's my everyday drive, my pride and I'd like it to be a sleeper

So I'm getting the VAG cable to see what can be played around, but what im really looking for here is how to modify it and what to use. Below is the things I'm thinking of:

1- brakes
2- exhaust
3- breathing system ( intake and headers)
4- ECU upgrade
5- threads ( tyres)

Your help and suggestions are very much welcomed.

I'll be posting a picture of my car later since I'm posting from my iPhone.

Cheers