We tried that service at MBS a few years ago; I think it's still the same company.

If the route hasn't changed, it's about half city driving and half highway (ECP).

We got both the Ferrari and Lamborghini, and they let us swap cars halfway.

You'll get much better value if you do this somewhere like Vegas, but if you're into this sort of thing and live in Singapore, it's a nice birthday gift.

Another option is to check out driving packages available on the track in Sepang.

Hope this helps!