i searched and didnt find much. I picked a stainless Y (federal spec) off a .orger very reasonable I need the gasket numbers from nissan or aftermarket.
thanks guys

 

you dont need any numbers dude...just go to a parts store and ask them for the gasket that goes between cat. and the Ypipe ... I went to nissan and they said they would have to order it, so I went to another parts store down the street and they had it, I got lucky

 

maybe...but getting non oem crush gaskets may contribute to poor fitment and other issues with the pipe sounding like A@@

 

20691-51E01 - 2 of those
20692-24U00 - 1 of those