Boxsters are to young I thought for Classic Insurance, as Dudeone says it is probably limited mileage you are looking for. I have mine set at 7500 miles per annum - but having had the Box for 5 months now that is too low and I will go to normal insurance next year. It was only a marginal difference anyway, but when I was quoted for mileage of 3,000 pa it dropped significantly. ( do you know how to wind your clock back? ) Your best bet is to take the NCB from the lowest group car, transfer it to the Porsche and start again with the other car. Some companies do assist with NCB accelerators (e.g. Admiral who do 10 month policies but give a years no claims at the end. I do all my insurances through A-plan - 2xcars, housesx2 and several personal insurances and when I had 3 cars last year they managed to find me a policy for the third car which started with an introductory 40% NCB. They want to keep my business and do try hard. It is also nice to deal with human beings who know your name and treat you as a person as opposed to dealing with several call centres who don't give a damm.