Unlike other sports, division rivalries are rare in auto racing.  But the NASCAR K&N Pro Series has changed that, bringing the West and East together for combo events annually.  With two of these joint events on the 2019 schedule, the first being at Iowa Speedway for the Casey’s General Store 150 for the 17th time, the potential impact on the respective championship campaigns is tremendous, not to mention the bragging rights that go along with it. At least until the second combo event in August at World Wide Technology Raceway at Gateway.