NASCAR is making aerodynamic changes, again, hoping to create more competitive racing. ''The rules package is what is on everyone's mind,'' Brad Keselowski said Friday after a practice session at Michigan International Speedway's two-mile oval. Part of the intrigue revolves around the fact that no one - including the drivers, engineers and NASCAR officials - is sure how the changes will shake out during the FireKeepers Casino 400 on Sunday, when Joey Logano will be on the pole. More...