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Originally Posted by Easy Rider
I figure that's the only place that rotating the air scoop would make any difference anyway; a ram-air effect. Might not even do that since it's behind a cover.
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The "ram-air effect" is achieved at very high speeds throughout a well designed ram-air system.
Let's compare it to the stock ram-air system of a sports bike like Kawasaki Ninja ZX-10R that boosts power from 128.7kW to 135.3kW. It's about a 5% increase. We could get the same 5% in our GZ250s (from 15.1kW to 15.87kW; such tiny increase) at a speed that we'll never reach (around 150 mph) and considering that our design is good.
Conclusion, you'll get an improve only if the original design causes turbulences and rotating the filter eliminates them, but not because of the ram-air thing...