"But in a way, fear is a big part of racing, because if there was
nothing to be frightened of, and no limit, any fool could get into
a motor car and racing would not exist as a sport." -- Jim Clark
Not a "significant difference", but something is a little bit improved
(rolling, for example).
However I too had N2, and the reason that convinced me on purchasing N3 was
the number of opponents (42) and of tracks (28), now completely redesigned;
native 3Dfx support; W95-98 (and not DOS) environment; enhanced graphics,
etc.
Stefano
Gunner