The more value your car is the more road tax / insurance you pay for it - depends on loads of different factors for example where you live, your age, accidents etc however Syds car in the UK especially because it’s heavily modified will because very expensive to insure because they are quite ‘rare’ and modifications are high risk, and her car will be a 2 or 3Litre engine which means it’ll emit more emissions in the environment so she will be required to pay more tax. If anyone watches Sarah Ashcroft she has a Mercedes G wagon, and they are still very uncommon in the uk, have became more popular over the years so insurance on them is a fortune, she was asked to pay £10,000 for insurance for a year! So she got rid of it, I imagine Syd will be paying a fortune to keep it running