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There is a revised turbo downpipe to attenuator clip design that may eliminate blow by at that O ring which drove the ETC red lightning bolt warning and a turbo underboss code (0299). The new part is A 642 098 12 39 (replaces part number A 642 098 00 39). The revised clip pulls the attenuator much tighter and more in line (not angled nearly as much) with the aluminum downpipe. Recommend using a new O ring with the new clip. The clip is $10 at a MB dealer. You may have to special order it or get it online.

It was a little tricky to get the clip to attenuator fastener started but it finally dug into the existing plastic attenuator screw hole.

Thanks for everyone's posts on the 07-08 GC diesel; they have been very helpful.
 
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