Eliminating upper Cat on stock downpipe??

[sirfallsalot243]

Originally Posted by !Zar!

Really? My s14 had a hollow cat on the bottom, and a fully functional honeycomb cat on the downpipe.

Same with another s14 I worked on.

I could be wrong. Maybe both just happened to have no center cat in my case?

No, youre right. My S14 came with a hollow second cat. I would assume its because thats where the real cat would be on factory SR20 S14's, and since we got the KA with a cat in the downpipe, Nissan just threw an "oem testpipe" there. Every S14 ive worked on has been this way, OBD2 or not.