I am in the process of swapping my oem exhaust for another oem exhaust (both ap2 2008) I am having a difficult time removing the 3 nuts that hold the rear part which I am replacing to the cat, it looks like I may have to split the nuts and replace them, I can't seem to find any details of the 3 nuts, one site says they are 10mm, but the ones I have are 13mm, and the website I usually use, myhondapartsnow isn't working.

I am also having to swap the chrome tips over as the second exhaust did not come with them, same problem though, bolts are seized and won't come off.

If anyone has any details of these that would be fantastic.

 

I had seized bolts on the tips. Bolts broke despite repeated spraying with penetrant, and applying heat. Had to drill them out and retap.

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I installed my exhaust this past weekend. The bolts are 14mm if I remember correctly.
I used Liquid Wrench penetrant oil and let it sit for a bit. Even then, it was extremely hard to remove with a breaker bar but eventually it came off.

 

I also believe they are 14 if I can remember correctly. Definitely not 10mm, that might be referring to the long spring bolts connecting the cat to the exhaust manifold. Those bolts are a pain in the ass to get off and mine rusted and striped so I had to use a strip bolt remover with a giant breaker bar to get it off.

 

You will need the 10mm to get the subframe brace bar off, along with a few 14mm.

 

You guys know he cant buy new bolts based on the size of the wrench used to remove them right? I gues I should say "shouldnt" he can do whatever he wants, probably a bad idea though. Id suggest bringing the whole cat in to a hardware store and finding some that fit.

 

I have had the subframe bar off before, compared to the exhaust that was easy!

I wont be reusing the nuts just becuase of the condition they are in, but when trying a breaker bar/torque wrench the nut was just getting stripped, 14mm fitted loosely, and 13mm fitted tightly but they didnt budge!

And from what I can see the bolts are secured to the cat so they wont be easy to remove, otherwise I would just replace both nut and bolt.

 

Should be 14mm make sure you are using a 6 point not a 12 point penetrate with some Pb Blaster followed by some movement tighten and loosen , or just take it to a shop they should do the job In a few minutes

 

Thats what I tried to begin with, all I got was a load of rust fall on me and then the 6 point 14mm attachment was too loose

 

Cut and drill out the studs on the cat, then replace with new nuts and bolts.
The oem nuts are M10x1.25 if you are lucky and only need to replace those.