Gunner,
I replaced the gasket when I put on my Maxxfab downpipe. I don't have the P/N available right now, but I just went to the dealership parts department and asked for the part. That said, my old gasket was fine and probably didn't need to be replaced.
The install of the downpipe is easy and the bolts are not hard to get to as AZ_IceMan states. I think he's talking about replacing the O2 housing. You can do the job easily with the car on ramps.
Three of the bolts on the flange are studs that stay in the O2 housing and the fourth is a nut and bolt. There is one really important thing about removing the nuts - which are lock nuts - USE SOME WD40 OR LIQUID WRENCH OR SIMILAR ON THEM BEFORE YOU LOOSEN THEM. The type of lock nuts used can tend to cross thread on removal, and if they do you will have a problem. If they start to get hard to turn when removing them, don't force them. Thread them back on a little and add some lube and work them off carefully.
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