Get ready Inland Empire kart racers! The final round of the Challenge GP race series for K1 Speed in Ontario, California is coming this Sunday to the well known Super Track facility. The six race series will be wrapping up the first half of 2011 on the reverse run track layout which has been a challenging but fun layout for drivers this season. The over-all points champion will also be determined at this final race as the points battle between the top drivers has been close all season. Come out this Sunday June 12th to K1′s San Bernardino facility at 6:30 PM for sign-ups, with qualifying starting at 7:00 PM. Double qualifying rounds and corresponding main event round will determine the field for this weekends event – don’t miss it.