I've just purchased a 2017 F type I4 and was hoping for some help please around a few areas I'm struggling with.

1.
I get the occasional rattle on start up which appears to be coming from either the rear back box. It seems to dissappear once the revs drop back down or are increased using the throttle pedal. (I thought a possible vibration from the exhaust heat shield but it appears tight).
I also get an occasional squeek when driving which I think may be the active exhaust valve.
I wondering if anyone else has had this and what it was and the fix etc.

2.
The button for making the exhaust louder by the gear stick doesnt appear to do much. Is the noise difference considerable? How do I make it louder?

3.
Im unsure if it has auto handbrake when momentarily stopped but i can't find anything in the handbook re this. Is this an optional extra/how is it activated?

4.
The same re powerfold mirrors?

5.
Has anyone fitted dashcam direct to the fuse box via piggyback fuse? Which fuse did you use and to which board? I can't get mine to power of any I've tried in the passenger footwell (RHD model).

6.
Is there anyway to get the phone to work on the heads up display to make a call etc without having to use the main touchscreen? The handbook doesn't help.

Many thanks in advance and sorry for all the questions!
😬