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It depends on the size. Pi * radius^2
2 (2") to 1 (2.5") would work. That way when you reverse the process (1 to 2), you aren't reducing the cross sectional area of your plumbing.
The pulse would travel down a single 2" pipe until it hit the first Y, where it encounter pulses from the other cylinder bank. It would be pulled into a single 2.5" pipe. From there it would be split into the two 2" pipes of the 1 to 2 Y-pipe. Each time there is a change in the piping, cross sectional area increases.
I would think a single 2" pipe would be too restrictive for 330+ horsepower, like if you went 2 (2") to 1 (2").
A 2 (2") to 1 (3") wouldn't be ideal because area increases with the first Y-pipe, and then decreases when you go back to your dual 2" pipes.
The best setup IMHO is to ditch the stock system and go with a 2 (2") to 1 (3"), and keep the single 3" pipe all the way back. I like the Supersprint setup because the Y portion is less dramatic than some of the off the shelf components. On the Supersprint system, the transition is gradual.
This is just my opinion based on broad interpretation of theory. To know for certain, all of the setups would need to be dyno tested.
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