There is very little wrong with a stock evo intake manifold, having a very large intake adds 15whp but at the 450-500whp range but adds a fair chunk of lag.
I'd say 2.5" is good for 350bhp then it starts to become a restriction although will still make more power. I have ran 750bhp on race fuel on a 3" system, over this look at 3.5".
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