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Cars and Transportation
Reply to "Replacing catalytic converter?"
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[quote=Anonymous]Dual exhaust system? Or single pipe with upstream and downstream cats? The difference matters. If it's a dual exhaust, replace them both. Even if the other one is working, it's near failure anyway. If it's a upstream - downstream system, odds are the front cat is bad, and the rear is ok. Replace the front, keep the rear. [/quote]
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