Any retrofit that doesn't require reprogramming of the car. I want to know this because I'm looking at a few new things to put on the car without having the dealer re-program my car because they always bitch about it when i ask them to. I want to install voice command, bluetooth, etc. Please let me know... thanks.

Depends on what level s/w you presently have...! Most of the time also the key has to be coded to allow retrofits to fuction correctly.

If you install voice comand and Bluetooth, they must "tell" the car that it has the new equiptment with a FA code.

Most of retrofits require coding. That sucks!
Here are things that need/don't need coding. Things with C require coding and NC means no need for coding:
1. Bi-Xenon - C
2. Nav - C
3. M5 paddle shift for steptronics - NC
4. Bluetooth - C
5. AUX - C
6. Comfort seat - NC

Named just a few. Other members can chime in.