Just got my coupe middy in the mail and decided it would be a good idea to go get new gaskets for the install. Anyways I did some searching and couldn't seem to find any part numbers on the forums so maybe this will help the people who are going to do the middy swap...

Donut gasket for Y Pipe to Mid-Pipe: 20691-0P600
Metal Flange Gasket for Mid-Pipe to Muffler: 20692-65J00

I don't know if this will help anyone or if I have even posted in the correct section, but hopefully this helps someone. -tSB

 

the Ypipe to the Midpipe, the part i got is 20692-8B410
I did not get a gasket for the Midpipe to Muffler..not sure if there is any.

 

When I was changing my midpipe I just stopped by the parts department, he made a print out, I should him what pipe im changing, and he automatically knew what gaskets i needed...it costed like 9 bucks and change for both ends...

 

metal crush ring gasket at once end, metal flat flange gasket at the other...like the above poster said, ~$10 bucks for both at a dealer.