A couple years ago I acquired a NOS set of Black Magic twin pipes for my 1998 ZR 440. I am now In the middle of building the sled, but I can't figure out why the PTO side pipe has two threaded bungs welded into the center of the expansion chamber, one above the other, and both different sizes. The MAG side pipe doesn't have any bungs, and the two that are in the PTO side I would think are way too far back for EGT sensors. Does anybody know what these bungs were for? I'm just going to plug them, but I'm curious as to what these were for.
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