Is My Header/Cat Ruined By Coolant

As I disassembled the exhaust and got to the header, I had about 2 cups of coolant pass through my header/cat via way of what I believe is a D-chunk (TBD). My main question is, do you think the header/cat can still be used as intended? (No, I�m not going to hollow out the cat or cut it out or any modifications). other questions: Does coolant ruin the cat material? Will the cat burn off any coolant? Can I �clean� it up??? To be upfront, this is regarding my 987. Why post here, first off I�ve been a member here for years �02 C4S) but this group seems to have more technical knowledge.

Google search leans towards coolant causing buildup with clogs the cat. You might take a look at them to see if they seem clogged or if the mesh seems narrower in one than the other. The header by itself should be fine to re-use.

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Well, 2 cups of coolant is not much. Don't see much of a problem here at all. I'd thoroughly rinse it with a garden hose, blow it out with compressed air, let it dry completely and call it a day. Hey, you're starting with a 20 year old cat, they don;t last forever. The bigger problem imo, is this D-CHUNK you're talking about. Forget about the cat.... Whats going on here,? tell us some history and events of why you say this,,,?

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Well, I have a habit of picking up rollers with blown engines (see C4S) and found a heavily modded �07 Cayman S. All the PO - and the Porsche dealer - knew was it stopped running and the engine seized. It couldn�t be turned by hand in either direction and the owner didn�t want to spend another few grand just to explore. I got it for a song. I dropped the sump when I first got it and all was clean/clear. Next I checked the oil filter and it was clear. I walked away for a few days and when I came back there was coolant puddled on the ground under the sump plate. My first thought was D-chunk figuring that�s how the coolant got in there AND how the engine was seized. when I started to prep the engine to be dropped I found all the coolant coming out of the header. That�s all I know until I pull the thing apart or borescope it.

Your cats and 02 sensors will probably be fine if they were good before ....If have replaced a lot of engines that had coolant running out the exhaust and the cats and 02 sensors were OK and not immediately junked..

Thanks Skip! So I found an article suggesting that the cats can be cleaned and recommend a mixture of water and citric acid. Here's the article. Note that this was for a diesel cat, so I'm not sure if they are the same, but seems worth a try... " Now scientists from the Institute of Catalysis and Petrochemistry in Madrid, Spain, have found that a dilute solution of citric acid can wash out the catalyst killers without damaging the platinum. When tested on a simulated stream of exhaust gases, the cleaned-up catalysts were as good as new, the team reports online in Environmental Science and Technology 1 ." And here's an actual post from someone that tried in on a Subaru forum: https://www.subaruforester.org/threads/catalytic-converter-citric-acid-bath-p0420.91379/

Just wash it out, use dawn dishwashing soap. The key is to get it clean so that anything that burns hot (oil) is gone and not create a hot spot - that is what kills it. So, any oil out- water will evaporate at 212 way before any damage. But antifreez may burn hot - not sure. Magnaflow now has CA certified cats- that is what I used.