My renewal fee with Admiral this year is £340 for a V6 with mods such as aftermarket alloys and induction kit. Obviously everyone's premium will vary according to age, driving experience, postcode etc, but they're worth a try. The multicar thing is very handy if you have more than one car in your household too, we insure both of ours on one policy (although each driver still continues to accumulate their own NCB) for appreciably less than we'd be able to if covering them seperately.