Years ago I rounded the front of the pistons on my B16B. Didn't notice any difference. My comment about keeping the bridge sharp was because at that point the fuel is being sucked from the jet so having the smooth airflow changed to "rough" helps the atomised air in the inlet manifold. It doesn't want to drop out of atomisation onto the walls of the manifold. This can happen with the alloy manifold as it runs cooler than the cast iron one. The GT one piece is the best of all of the various one and 2 piece setups. The alloy inlet looks cool but it may be too cool at times!
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