It would be interesting to find the cause of the stock exhaust manifold failing. Obviously it takes some years and exposure to road conditions to cause the failure to start. I've not heard of stock manifolds failing in the first few years of driving. Maybe over time the exhaust manifolds degrade/rust and then get splashed on with cold water when hot and "crack". Perhaps buy the Dorman replacements, and get them ceramic coated? Then install the new manifolds with the upgraded stainless steel fasteners with the lock tabs to maintain the torque. Sure it adds some cost but if it makes a reliable leak free exhaust for a lot less than headers it may be the choice.