Hehe, actually, if you want to go as fast as the car will let you, you have to 4 wheel drift through practically every corner. Tires have the most grip when they are slipping a certain amount (a pretty small amount), if you are using up all of the grip you have available to you, you are going as fast as possible for the current car setup and tire combination. If the tires aren't sliding ever so slightly through a corner (the car not 4 wheel drifting), they are not at their highest grip level, if they are not at their highest grip level, it is possible to go faster without loosing control (be at the limit), or use up all the grip available if you prefer. Therefore drifting IS the fastest way through practically every corner, it can't be a huge drift nor must it be always noticible, but it still is a drift (a 4 wheel drift that is). So even formula 1 cars drift, you just can't see it.