[S4D]

PHP код:

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if(GetPlayerState(playerid) == PLAYER_STATE_DRIVER && newkeys & KEY_FIRE)
    {
        UnflipCar(GetPlayerVehicleID(playerid));
    }
    return 1;
}
UnflipCar(vehicleid)
{
    new Float:angle;
    GetVehicleZAngle(vehicleid, angle);
    SetVehicleZAngle(vehicleid, angle);
    return 1;
} 


Then use this function in your command