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I have problem in Porsche Cayenne S v8 2008 the problem strat after 400,000 km thousand Exhaust Catalytic Converter (front ) right and left ( I attached photos before cleaning and after ) I solve problem I removed just carbon (cleaning) in front right and left , code fult p2237 the sound for exhaust not effectively it will be like before removing carbon (cleaning) exactly (if changing part good for environment but it’s costly) , (but don’t removed rear catalytic converter ) that part number for front Exhaust Catalytic Converter 955-113-022-CX / Catalytic Converter right 955-113-021-CX / Catalytic Converter lift