Engine mods and insurance

[Jay 535i]

For those of you with modified motors, have you told your insurance companies? What do they generally say and do?

[whiskychaser]

For those of you with modified motors, have you told your insurance companies? What do they generally say and do?
In the UK you can just about get away with putting in an air freshener without the insurance calling it a modification:
http://www.carinsuranceexplained.com/car_insurance_explained/declaring_modifications.htm
Combine this with where you live (hit the postcode risk list tab) and you can just see them rubbing their hands together