When ever you take out insurance on a vehicle one of the key questions they ALWAYS ask is;
"Have there been any modifications to the vehicle?"
This means ANY modifications to the manufacturers specification for that particular vehicle. It does not ask if you did the mod or someone else, it asks for ANY.
If you fail to declare it your insurance is invalid and will not pay out in the event of a claim. It means you are paying premiums for nothing. It also means you are driving whilst un-insured and can be prosecuted by the police.
This information was supplied by a friend who works for LV Insurance.
The decision is yours.