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Wulff, you may be in danger of having too much port area if you streetport the Y intermediate. Heck you may have too much just with a stock ported Y.
I basically suck at math but I know rotarygod ran the numbers for 6 port intakes and discovered that there is a happy ratio between total port area and total flow capability of the stock intake manifolds, resulting in a little bit of natural supercharging. The RX-8 is basically perfect in port area and total manifold CFM, and that's why it has so much all around good drivability.
If you're up for a little experimenting, I'd like to recommend a course of action for you. If your current setup is pretty well dialed in and you know its quirks etc, it would be very educational to swap in a non ported Y plate and see how it changes things. Then at some later point you could do a port job on the Y and see whether it increases power or decreases. Be sure to get dyno runs as well as daily driving in on it. Then we'd have a body of information to show others contemplating bigger ports on a 6 port, and whether to recommend against it.
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