So the MINI coupe has a torsional rigidity of about 24,500 nm/deg stock, the cabrio XX nm/deg? What kind of increase could one get with a full weld in cage? I know it might vary based on the angles and design of the cage. Has anyone tested a race preped MINI on a frame rig that measures rigidity? What about the texas speedworks X brace? Tower bars? How much I would those add? I know that without race slicks and a hot asphalt track, adding rigidity will mean nothing because you'd exceed the grip of street tires before the increased rigidity comes into play. Any thoughts?