Adding modification to motorbike insurance policy after I've paid upfront for a years insurance?

Adding modification to motorbike insurance policy after I've paid upfront for a years insurance? - 1
Added (1). Hi, collecting my bike on the 12th November from the Honda dealership, thinking of putting an aftermarket exhaust on soon after I get it. But as I will be paying for a years insurance upfront what will happen when I want to add the modification to my insurance? Will they not allow it or will they make me pay a price to make up for the insurance increase, Any help will be appreciated, cheers.

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