The ones on the right are the stock ones and I do not know if you will see an improvement (emission wise) with them. You could always have your headers ceramic coated or wrapped to hold the heat in them so the exhaust does not cool off.
I have the Vis hood with the DF duct for the single fan and it fits fine. To make it have a closed off fit to the hood you will need to fab up something which is rather easy. I would send you a pic of my setup but I am currently in AZ.
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