xr6tc, mate just buy a cheap helmet and run the car on your street tyres. It really is not that bad, I went 11.5 in full street trim with well worn factory dunlops.... Forget spending all this effort for tyres, preping the car etc... Just fill her up grab your helmet and go racing..... You will find it takes you a couple meets to feel comfortaple with running the car, by that time you should have pushed you street tyres to a good time. Then buy some slicks and see how far the car can go.