 Complete the following phrase:  In April 2006, Roth sold his Pro Series equipment and announced that he would move up to the IndyCar Series full-time, starting with the 2006 Indianapolis 500, however Roth failed to qualify for the 500 after crashing his car in practice late on Bump Day before achieving a qualifying run. He returned to the series at Michigan International Speedway in July and ran two more races at the end of the year. In 2007, he ran the 