I just picked up the OEM donut gasket from my local mitsu dealer today, and the stock donut gasket seems to be a hair too small for the Ebay o2 housings outlet, nothing that I can't take a dremel to real quick and fix. I was just wonder how many other people running this o2 housing with the stock donut had the same issue or if theirs slipped right over no problem.

 

Its not too small, just an extremely tight fit.

 

+1

 

Ok sounds good, I didn't want to push to hard and crack it, that's what I did with the cheap donut gasket that came with my exhaust.

 

Well, it definately didn't fit, I took some sandpaper and 15 minutes, and now it fits like a glove.