I bought a Stebro stainless J-pipe that Frank
Condelli promotes.  After it arrived, I realized
that it did not have the sniffer port.

I had my local muffler shop weld in the appropriate
tube with cap.  They thought it no-big-deal.  It
is prolly not the same stainless, but....

Frank said if I had only ASKED, I could have gotten
one with the port already installed.  It was my
mistake not to think of it.

Anyway, check your local muffler shop.

                        Richard A Jones
                        Boulder, Colorado