Well after finaly fixing my veccy and engine being sweet i now have a problem, cat is blowing at join to middle box, i fixed this by tightening it more but now cat is very rattley and loud. Also i have metal flakes coming out of my back box. Take it cat is knackered? i did do precat removal would this of done the damage or would it of been knackered before??
Also if i replace the cat, would it be easier to put the down pipe with pre cat removed onto the new cat or just remove precat from the new section??