got a grand caravan and the exhaust and muffler is clanking and rattling for a long time now. due to age na rin siguro.... had it checked to a nearby muffler shop and the mechanic said that the catalytic converter is already bad. the components inside the cat converter is already worn out. he said it is non-repairable and removing it will eliminate the clanking noise. however, it has an O2 sensor and therefore removing it will lit up the Check Engine Light. is there a workaround so that the CEL will not lit up and still perform as before. i think the cat converter is there for emission standards....