[71K20chevy]

Originally Posted by 1972GMCsierra4x4

Lol on the open headers. Straight pipes with factory manifolds were bad enough!

As for the primaries, I wanna say that they're 1 3/8" or 1 1/2". I can't remember right off the top of my head

I'd say probably 1 1/2", 1 3/8" seems pretty small.