I have recently purchased a 2007 X5 4.8i and i'm loving every minute of it. But i have a couple of things i'd like to ask your help with.
1. Does anyone have a link for led bulbs that will fit in the reading /map lights?
2. I have the sports package which includes 275 40 20 and 315 30 20 tyres, how important is it to have star marked tyres? And can i move to a non staggered step up of say 275 40 20 both front and rear?
3. Is it worth mapping?
4. Has anyone changed the exhaust on one of these to improve flow and sound?
5. My rear light on the tail gate does not work, how easy are these to source and replace?
6. What brake pads and discs do you recommend?
7. Satnav is a 2007 issue, how easy is this to change or update?
8. Whats the best mod / trick or hint you can offer

I'm sure i will have more questions soon, but thank you all in advance for any help you can offer.
