Well, you can always race modify the Taurus, you just get a different result in 1.0
First, there was 1.0, the really buggy version, with all the misspellings and glitches and stuff. And your garage does not empty out every time you make 9 records on the Max Speed test. I know, because I used 1.0 for a looong time without any problems, including setting many Max Speed Test records. I think it's something to do with the way you set the records or something, but I'm not 100% sure, so if anyone wants to try to set off the bug, save your game beforehand.
Then, there was 1.1, which had some of the stuff fixed, and causes a little trouble to gameshark users without an enable code. (if you have to ask, don't)
Then there was 1.2, which had a few more things fixed, and is supposed to be the Final version.
Finally, there's the greatest hits version, which is essentially 1.2, though occasionally this doesn't seem likely, as some gameshark codes that work with 1.2 supposedly don't work with all copies of the greatest hits version.