K1 Speed in North San Diego County is hosting round IV of the Challenge GP Race Series this coming Sunday October 16th on their high-speed indoor asphalt facility. The well known Carlsbad location has brought the top drivers from San Diego and Orange County to the best in indoor kart racing for some great on-track battles for the second half of the 2011 race season with multiple talented drivers making podium appearences throughout the season. Sign-ups will begin at 630pm with qualifying beginning at 7pm. Double qualifying rounds and corresponding main event rounds will place drivers accordingly. Entry fee is just $50 per driver.