997.2 exhaust bolts consensus.
 

Just get it taken care of. Maybe go with an independent mechanic unless you don't mind dealing with seized and corroded fasteners. I don't know how bad they are, but you could try my method. Tighten the fasteners instead of loosening until they break. Hopefully the bolts will just pop out with a strong whack of a hammer and a punch. In my case, I got all the bolts off the cats like this except for 1. I had to cut it out with a Dremel and a tungsten carbide cutting bit, then drilled the rest. It took about twenty minutes. Here is a link for a video I made:

https://youtu.be/4JxkzWTcs6k

Hopefully once you get to the spark plugs you have no issues removing them. If there are any signs of trouble, take it to a pro immediately because you don't won't to mess anything up on the engine.

Best of luck!

2009 C2S 130K miles

Those bolts are a problem NOT. I get looking for projects but this is not one of them. As docdrs noted, only on a muffler mod.... I did the Sharkwerks and am very happy with it BTW... and then you will most likely need to change the bolts because you will probably break at leas one.

If you are looking for projects, then check around these boards and see what folks are doing. Of my tweaks and mods, the best ones I did were the Sharkwerks xpipe and the Numeric shifter and the DSC PASM control module. All are something I enjoy evertime I drive and I highly recommend them to anyone (the DSC is only for those with PASM). In order of importance to me, the DSC PASM controller made what I thought was sub-optimal shock mapping to very good, so this was a requirement for me. The Xpipe is ear candy but took a car that sounded like an idling Buick to at least something with a bit of character.... not essential but I thought I purchased a sports car...... the Numeric was a real pleasant surprise. Again, not at all essential but makes for a really nice feel. The xpipe and the numeric are all about getting this overweight GT car to being a bit more like a sports car. The DSC was the elimination of annoying ride and mitigating a wiggly back end under hard acceleration on uneven surfaces.

Peace
Bruce in Philly

can you clarify how you can check if the plugs were done ? I am in the same boat- 2009 c4s with 42K , and am having some challenges reconstructing service history. I am buying through the dealer, who is selling the car on consignment from a customer of the dealership ( non porsche ). Current owner thought the previous owner had done the major service , but couldn't provide any written proof. The porsche dealership the previous owner had used is no longer in business, so I can't check with them. Carfax doesn't show much.

I know of now way of telling if plugs were changed. However, how long did the current owner own the car? Plug change interval is 40K miles.... so this guy/gal should certainly seems like they should know 'cuz they owned the car at this time.

Peace
Bruce in Philly

The current owner had the car for 2 years, but only put 3K miles on it. Apparently, he also has a Ferrari, so he wasn't driving the Porsche enough to justify keeping it. Since all my discussions have been through the dealer, it's been a little difficult getting all the details. I'm going to ask the dealer to have the owner reconstruct any work that was done , other than the recent brake flush/oil change that the dealer recently did. The car still looks like new, so it has obviously been well maintained from a cosmetic standpoint.

If the plugs were changed 5k miles ago, what would explain the corroded bolts? If the colts are in really bad shape, I don't know how they would have removed and re-installed the mufflers while re-using them.

I have experience here ...
 

You don;t need to remove those three bolts to do a plug change. There are alternative approaches.

Peace
Bruce in Philly