CREATE TABLE table_16670746_2 (fastest_lap VARCHAR, winning_team VARCHAR, circuit VARCHAR)

Who had the fastest lap in the race won by Team Impul at the Twin Ring Motegi circuit?
SELECT fastest_lap FROM table_16670746_2 WHERE winning_team = "Team Impul" AND circuit = "Twin Ring Motegi"
SELECT "fastest_lap" FROM "table_16670746_2" WHERE "Team Impul" = "winning_team" AND "Twin Ring Motegi" = "circuit"