CREATE TABLE table_14177 ("Year" FLOAT, "Class" TEXT, "Vehicle" TEXT, "Position" TEXT, "Stages won" TEXT)

Which class had a vehicle of Nissan in 2007?
SELECT "Class" FROM table_14177 WHERE "Vehicle" = 'nissan' AND "Year" = '2007'
SELECT "Class" FROM "table_14177" WHERE "Vehicle" = 'nissan' AND "Year" = '2007'