Thinking about this later, I've got a nagging feeling, when I was back in the dealer in 2001, I changed one myself, and it only had one monolith in there....
But as time has a funny way of distorting the mind, I can't be 100% sure.
However, I purchased a '98 Merc ML320 some time ago that had a raspy o/s exhaust system, and emissions test figures for the previous 3 years that were close to the limit at idle. Turned out to have neither pre, nor main cat in the downpipe, even though it had both pre and post O2 sensors (no DTC's for cat).
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