If you are not satisfied with the physics model in the game from
Europress, you might want to try this game. There are jumps, slidings
and turnovers. There are also Subaru Imprezas. However, it's not as
fast as the game from Europress and you'll need to have at least a
Pentium-75 to run it.
http://www.racesimcentral.net/~b2506046/rally.zip or
http://www.racesimcentral.net/
Any comment will be appreciated.
Note: This is not a commercial product and will probably never be
one.