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2010 C2S 108K miles

 

I was planning to replace the plugs.  I went to remove the mufflers.  They were very corroded - especially the two I do not have to remove.  I used penetrating oil (acetone + AFT).  They are much prettier, but they are still corroded.

 

Here is a 1 min video of the bolts so you can see what I am facing:

 

Questions:

If I get started on removing them and it does not go well, what next?  Surely I don't have to replace the catalytic converters?  Are the bolts somehow replaceable?

Do they look too far gone?

 

 

 

 

Screen Shot 2017-02-08 at 5.20.13 PM.png

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Sometimes you have to cut the bolts away and press out or drill out the stubs and replace them.   Other times you can cut away just the nut and stave the studs.  When they really get nasty, like daily drivers in the Northeast with tons of salt on the road, you don't have a choice.  Some have taken to replacing them with stainless steel.

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Late to the party but I had the same issue on my car.  Fortunately only one bolt broke.  If you can just put a socket on the bolt and attempt to loosen them till they break.  Then take an air chisel with a point tip on it and they will pop out in about 10 seconds.  You will have to take off the bumper cover so you can have a straight shot at the bolts.  Also makes changing the plugs and taking the mufflers off super easy with the bumper cover off.  I put up a video on YouTube and it only takes 10 minutes to remove the bumper cover. Don’t know why anyone would attempt a plug change without removing the bumper cover first.  Also these bolts are not available from Porsche as they are indeed splined. I went to every muffler shop in town and couldn’t get a replacement splined bolt.  Eventually bought a generic stainless steel bolt so I won’t have this problem again. 

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