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ram air can be effective, but it all comes down to positive and negative pressure zones, and temperature. if you can increase the pressure at the entry, and reduce the pressure at the exit, and more importantly, do that while lowering intake temps, you will gain power. on the 968, we gained almost 11hp by merely opening up the airbox, and using a better filter. ram devices show even more when used in conjunction with that.
the key to effectiveness is reducing turbulence. the accordion hose in the pic produce turbulence. that will cost. the length is also an issue. i would fabricate a mandrel bent pipe to handle most of that, and just use couplers where needed. the entry also needs to be smoother. i would get the hose to go over the plastic funnel, and not inside it. the funnel is doing very little if the hose is not connected to it and sealing off the edges.
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