I guess I'm a little confused but if you disconnected the exhaust system and nothing changed why would you have to re-visit the issues of the cat's being clogged?

Seems like you've already replaced a bunch of parts, was there any diagnosis done before they were replaced? If so did the replacement of the parts cure whatever issues were discovered in the diagnosis process?

I can second Skid-rows comments, my CDI comes off the line with real authority. Traction control can be activated at will with full-throttle applications on dry conditions up until around 20-30mph.

0-60 times are in the mid 6 second range and accompanied by lots of nice black smoke. If yours isn't acting like this something is amiss.

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98 Dodge-Cummins pickup (137K)
13 GLK250 (157k)
06 E320CDI (341K)
16 C300 (89K)
82 300GD Gelaendewagen (54K)