Hi,
Anything that has changed since the car came out of the factory could be classed as a modification, depending on the insurer you are with.
As a broker, we would rather have too much information than not enough and we're always happy to advise our customers by looking at their own unique circumstances.
There are some grey area items but your broker/insurer should be able to sift those out if necessary.
The bottom line would be, declare everything so there are is no question of non-disclosure.
Aside from the mods question, if you're not already insured with us, and your renewal is due, feel free to call one of team for advise, and hopefully, a reduction in your premium.
0800 917 2274
Regards
Simon