[Rodrelic]

My Opinion only, I think the cast iron absorbs sound, tubes keep the rumble bigger, also my stock 37 manifolds look the most inefficient I ever saw. I used 2” from the center and the 1.5” coming into it from the ends. Got U bends from speedway and made the flanges, not expensive. Don’t know how difficult it would be to make the pipes up in a fender car, I test fit on my car and then bolted pieces to a bare block to finish weld. Could have made them block huggers and go inside frame, probably next time.