Round 5 of D1GP for 2011 was held in Okayama on June 26th 2011 way down in the south west part of Japan. Kumakubo came out victorious when he beat the other mega horsepower 4-door driver in the final, Daigo Saito. It was Kumakubo’s first win in his new 1000ps Laurel. Since he debuted in …