Actually neither flows better. The chamber shape is what makes one handle boost better than the other, and that would be the GSR.
EDIT: Theres a flow chart on www.b20vtec.com with both heads on it. Theyre almost identical. For one reason or anotehr I cant post the chart from work.
The gsr head has something called quelch pads. These do something to help ward off detonation. I have read this from a couple of different sources, but am not sure exactly what they are.
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