cusco type os. they make 2 kinds of bars, type 1 and type 2 in the os range. too bad for corolla they use only type 1 bar in the construction, the weaker kind. although the differences in stiffening may be little, c-one type r bar is a stronger design than cusco type os. if you want something heavy duty you can check the 4 point bar of ultra. i put wrote about all them including carbing and the newest red trd bar in owf, i already pm you the link. part numbers, prices, links, pics etc all there.