Hello...the road tax brackets are shown below.
i've checked the emissions on the golf 1.9 GT TDI 150bhp (standard model) and the emissions for that model stand at 146 g/km. if you consider your re-maped car to have similar emissions to that, you will stay in the same bracket as it is currently £110.
Tho this is not by any means the bible and i've not heard of anyone from this site re-testing following a re-map for up to date emissions data, sure someone will tell me if i'm wrong.
Road Tax Calculator Band CO2 Emissions figure (g/km) Petrol Car, Diesel Car, Alternative Fuel Car .
A up to 100 £0, £0, £0
B 101 to 120 £40, £50, £30
C 121-150 £100, £110, £90
D 151-165 £125, £135, £115
E 166-185 £150, £160, £140
F 186-225 £190, £195, £180
G Greater than 225 £210, £215, £200
