The K1 Speed Challenge GP Race series heads into round four this weekend with K1 Speed in Phoenix, Arizona hosting this Sunday for the best indoor kart racing action in the Southwest. The large concrete surfaced track is ran IN REVERSE for this race series proving to be a fun and challenging course layout in the opposite direction. The overall points championship is on the line and drivers are all aiming for a podium finish, and the best possible finish in the overall standings. Come out this Sunday April 15th for sign-ups at 6:30 PM with qualifying at 7:00 PM. Entry fee is $50 per driver -BE THERE!