Yes they all apply if you import on a business visa (a carnet applies only for a short term stay and on a temporary resident visa which is 90 days for most expatriates). Your visa type is important and will be asked for. They (Customs) will have their own assessment system and not on your supplied value so it could be based on the local retail price. BTW COE's once were S$60K whilst I was there and could be that and more at any time depending on demand and availability. They are restricted to the total number of cars on the road at base set period which is controlled by the Government and that means you are buying a 'retired' COE. Basically they do not want you to import a car as it upsets the local importers and if very easy to do can end up a 'back door' import sytem. Local transport is extremely good but a Porsche puts you up there amongst the local elite. If you want to go though the hassle (which it is) you need to stay for some time at least 3 years. Note that driving to the city in Singapore is like the London traffic control system. Petrol is not that expensive though!