It can be done...but I'd look to get a proper set of manifolds/headers on there first..you'll see far more gains via that avenue over fiddling with the stock system..

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
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Enthusiast Service, Restoration & Tuning.
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Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta