Guys, are we still on this topic about not having sedans in GT4? *slaps forehead* Cmon, get over it already...grow up....just enjoy the game as it is. Hopefully the next installment will include the sedans and many other cars that fans like.
Now for the topic of the sedans and wings. Yes, it may be true that putting a wing may make it handle like a sedan in the game. But the point is that the weight distribution is dractically different. In fact, the reasons Japanese FF derived touring cars are sedans are because of the longer wheelbase (therefore more stable with slicks and rear camber) and the weight distrbution that makes it less twitchy and unflickable than a hatch. Yes, it is more difficult to get a longer, heavier sedan through a twisty track than a hot hatch, but that is a catagory nontheless.