NASCAR makes another change to aero package at Michigan race (The Associated Press)

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.