Hi Steve As you rightly say it will need a full cage or FIA roll bar with the petty strut and of course the engine will need to go back to Academy spec., 125 bhp, maximum power in class 1 is 130 bhp. You will need different tyres, the Toyo's on the car are List 1b, class 1 is limited to list 1a and almost everybody uses Yokohama A539's. You could probably sell the wheels and tyres on the car and buy wheels with the correct tyres on without any extra cost. We look forward to seeing you both in 2022!