I know that this may depend a lot on what car and what company you're with but I was wondering what (roughly/on average) stuff like:
New alloys
Changing Front/rear bumpers (not Chavvy ones, subtle styling ones)
-would add to an insurance premium.
And does stuff like new head units and speakers need to be declared, if so how much would that add to the premium.
I haven't got my car yet but I'm just trying to see what kind of money I would need and to save up/get a job
Thanks for any replies.