You should declare all mods to your insurer, including
stickers in theory.
When I updated my insurance with the Stage 1 remap, springs etc the admin fee of £24 cost more than the change to my actual premium (£23.98) LOL
My insurance without mods was £525 or there abouts. My renewal with mods is £550. I’m old with no points etc. However my wife had a none fault claim 18 months ago, and if a previous insurer is to be believed I live in a high risk area for accidents and theft. So take what you will of my quote.
When I changed my exhaust completely and rang to declare it they wouldn’t insure me after it was done, so had to arrange new insurance through Adrian flux. My
280 with mods declared for close to £800.
I have a strong suspicion that one of the reasons my Carbon’s insurance is less than the older
280 (even when standard it was £650), is because Front Assist became standard spec for the facelift 300’s. My
280 had it as it happened lol