Without any codes, or any readings out of place my wild *** guess is that it's not anything terminal. With as much new piping as you've put in a small space, I'm guessing it's a clearance issue. How much did swapping the header flange change the piping downstream? Is everything still in the same place?
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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