Woody, I'm basically making a H/E like your dual fluid-cooler design. While the stock size of 5/8" hose fits great over the inlet and outlets, the actual flow inside the H/E tubes are 3/8"

Will this be worse than stock? Or is the stock restriction so bad that even this new size, since its very free-flowing, would still be better than stock?

And also, for anyone who knows, do you think the MB yellow coolant, which is their latest coolant for aluminum engines, will work with our factory fill blue coolant? I know it will work with the engine itself, I'm just wondering about its interaction with the stock coolant.