Using cast iron exhaust manifold question

Its sonOramic. Dude thats cool. Only seen a long horn crossram in books, and in an old johan 68 300 model i built.

Its for a heat riser for preventing cold start idle issues, and carb icing in cold damp weather. If your sonOramic doesnt have heat risers which i can see they obviously dont, i guess you can cut it off, or why not wire it full open. You may eventually change to a different manifold later on for a different reason, then you will wish you had not cut it off.