I would agree with Mort on this one, there have been plenty of proven gains from partial and full grill block, but I have yet to see anybody prove any gain from ram air at other than WOT(Wide Open Throttle), and even then the benefit was negligible.
@Mort, also take into account that most full load (100%) acceleration isn't done anywhere near full throttle and you effectively make any possible gains from ram air null and void. On my Ultragauge I accelerate at ~30% TPS, Idle is 14.1% TPS and pedal to the floor shows 76% TPS. I rarely get to even 50% TPS and therefore don't ever get to WOT which makes ram air useless
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