in the 70/80" we have the same problem with buggy & KitCar, we solve it by adding some softness any exhaust specialist can solve that easily
Problem is Chester that if you introduce some 'flexibility', which I assume you mean by 'softness', the fixing point is so close to the cut out in the wings that the exhaust would constantly rattle on the edges of the cut-out as indeed it does when the brackets fail...
