What I am trying to ascertain is whether keeping the intake size the same while increasing the exhaust tube area might be less efficient than going to a slightly larger intake to fill the now larger exhaust area better. I would think it would but I don't know. I'm not an expert on port velocity vs. volume or what have you.
It's like connecting two different pipe sizes. Generally when you increase volume on one side of a pressurized tube it has the effect of slowing down what ever is being pushed through the orifice when it hits the larger area. If you keep the tube or pipe the same size on both ends, the increased volume may drop overall pressure but there won't be a change from one side to the other. I know that's not a perfect analogy because there's a lot more going on in an engine but it's not too far fetched to break it down like that.