The service manual calls for removing the MAF when replacing the air filter, then replacing the O-Ring after. Have you all replaced or reused the O-Ring? I did not see it on Mike's 60k list, but think maybe it should be. I ordered it today and will just wait to do that item.

 

Didn't change mine out last year when I replaced the MAF. You should check it for any damage, and if it's ok, keep it for a spare. You never know...

 

Kept mine also. If it ani't cracked or kinked, just claen it with silicone spray and re-install. At least that's what I did.

 

As long as the o-ring is in good shape, leave it along, mine is going on 10 years old.