Hi Paul,
I'm sorry to say that insurance groups never go down. The reason the MX-3 is a group 15 is because of the V6.
Don't be totally dismayed though, because the group rating isn't the be all and end all. I'll give you an example from experience. When my friend was looking for a new car, he had a choice between an MX-3 V6 or a 1.6 Citroen Saxo VTR. The Saxo is a group 8, but the insurance quotes he was getting on the Citroen were WAY more expensive than the Mazda. This is down to the 'reputation' that the insurance companies associate with a car. The Saxo VTR is renowned for being cheap, easy to modify and resonably quick, and has been a favourite of the 'Max Power' boy racer types for several years. This reputation increases the premium. On the other hand, the MX-3 is relativly rare in the UK, and doesn't have any sort of reputation to speak of, so the premium is lower.
The best place to look for car insurance is
confused.com, They did both me and my friend a great deal on our V6s. They search all of the online insurance companies and give you a list of the cheapest.
I currently pay £650 fully comp on my modified '92 V6 (I'm 24 with 1 years no claims, have been driving for 7 years, but do have accidents on file and speeding points too), and my friend (24, no no-claims, been driving for 6 years, no accidents or points) has got his for £500 fully comp.
If you shop around, and play the companies off against each other, you will get a better deal.
Hope this helps a bit. Good luck!
<small>[ October 06, 2004, 02:59 AM: Message edited by: storm99 ]</small>