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While you might gain something at near wide open throttle, the resistance of the box inlet is only significant under very open throttle conditions, so you would not notice much difference druing normal partial throttle operating conditions... and as you mention, it will be noisier... and there could be issues during rain also.. the air inlet of motorcycles is usually designed to be protected from water in wet weather..
While you might gain something at near wide open throttle, the resistance of the box inlet is only significant under very open throttle conditions, so you would not notice much difference druing normal partial throttle operating conditions... and as you mention, it will be noisier... and there could be issues during rain also.. the air inlet of motorcycles is usually designed to be protected from water in wet weather..