from an article in the Times Online today:
"If you are tempted to upgrade your car - or in the parlance of the street, pimp your ride - you might like to think again after research indicates that modifications such as adding a rear spoiler could add up to 171 per cent to car insurance.
The study by BeatThatQuote.com, a price comparison website, also says that altering a car above factory standards could greatly reduce the chances of even obtaining a quote. Insurers willing to provide a quote declared a 25 per cent mark-up in premiums for the addition of a rear spoiler; 50 per cent for darkened windows; and a whopping 171 per cent for lowering the suspension."
Maybe not truely applicable to the Exige market…