magnum factory exhaust sizes question

The sizes of outlets that I've seen (and I've seen a few) are 2 1/8", 1 7/8", 1 5/8". Mopar never made any manifold that had a larger outlet than 2 1/4" (340 manifolds). The 340 manifolds a just a hair over 2 1/4" (may 1/16" over). If yours are a little over 1 3/4" that's very close to 1 7/8". That would be the second best size outlet. The largest magnum manifold came with a 2 1/8" outlet (1990s).

Treblig