Eliminating upper Cat on stock downpipe??

[dued]

Car: 1995 S14


Hi, this might be a dumb question but here it goes: I currently have a stock header, stock downpipe, and stock cat with a 3" cat-back exhaust.

I noticed that the stock downpipe has a cat at the top of it, and a stock cat at the end of the downpipe. So I was thinking if I were to buy an aftermarket downpipe + test pipe, would the downpipe eliminate the upper cat? I know that the test pipe will eliminate the final cat, but my goal is to eliminate both.