I got this mini pipe at a swap meet yesterday in San Antonio TX. The total length with header is 15 inches. My guess is that this thing is intended for a 60 size engine. The straight piece on the outlet side threads into a brass insert pressed into the mini-pipe. The location of the pressure fitting is in the straight section of the header. I can tell the header is not a Macs header.

Before you ask why I bought this let me tell you. It was bundled with a NIB MVVS 40 size mini pipe that I needed. For $15 I got both.

If you know anything about this thing please let me know.

Thanks,
Pete