Just put on a new Bosal Catalytic converter on my '86 740 and a few days later I started hearing a loud exhaust leak from under by the Cat. I looked underneath
and there was a hole in the upper end of the cat where a plug had been. I presume this is for an oxygen sensor on certain models. That dang plug was loose from the factory and had rattled out in a couple of days. Now I'm faced trying to find the right sized plug or taking the Cat back to AZone and bitching and having them order me another one. So, a word of warning, if you have a plug on your new Cat, put some Locktite on it and crank it in!!!!!!!!!!
'86 740
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