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Bigger does not necessarily translate in better, especially on the header pipe size. There should be a fine balance between say the physical parameters like the length, diameter and the wall thickness of the tubing, how the pipes are routed, are header pipes equal length, the type of collector, the length of the collector, the material the headers are made from, and how they are welded together AND the dynamics of it like temperature, pressure, and sonic energy. Ultimately what you want is extracting gases out of the engine at a higher rate and help create a lower atmospheric pressure in the cylinder before the intake valve opens.
Not going to go into too much details but, like I said, there is a reason why some headers or majority of them have the 2.5/2.75" exit pipe and different size of the actual runners. What follows after the header is much less important! You can go 3" (start saving now for an internal ear implant) or less!
If you are pushing big power, then a bigger size pipes might benefit, however for NA, there is no point!
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