CREATE TABLE table_70708 ("Year" FLOAT, "Team" TEXT, "Co-Drivers" TEXT, "Class" TEXT, "Pos." TEXT, "Class Pos." TEXT)

The Le Mans Porsche team Joest Racing is in which class?
SELECT "Class" FROM table_70708 WHERE "Team" = 'le mans porsche team joest racing'
SELECT "Class" FROM "table_70708" WHERE "Team" = 'le mans porsche team joest racing'