Picking up a new silver/black 325 and just wanted to check in here;it's my first BMW. Some questions:

1- Any recommended mods and the best place for aftermarket performance accessaries? Any links would be appreciated....

2- Car has the satellite radio prep but I didn't get the radio as I have a portable Sirius unit; can I use the wiring already in the car for use with my portable unit?

2- Anything a newbie should be aware of?

Thanks!