Hi. I am asking for advice about replacement catalytic converter. How good are the replacement catalytic converter compared to the original. Basically I found an exhaust blow near the front of the pipe just before the first of the rear silencers, after the catalytic converter. The bolts at the joint between the catalytic converter and the rear exhaust are practically fossilized. I have an angle grinder and various other tools to try and split the pipes. The reason is that the catalytic convert