hay all, have a question i been having problems with driver side exhaust leaks at the manifold to flang tubing. i mod the exhaust cattless 2.5 tubing to the back, with flow masters. the problem is i keep getting a manifold to flang leaks with a check engine light stating running to lean on that side. I've change out the flang twices and check for cracks at the manifold none found, but a month or two later I develope a leak. I have gone back check for any nuts backing out and they are tight, but you put your hand around the flang their's a leak, has anyone else seen this and if so what the fix. I am going to go with the short header later but would like to fix this before going on. thanks