When the car is moving there is heaps of fresh air running from front and under the car to where the Icebox horn/CAI filter sits. I did some testing with my RSM and g sensor with the air ramming into the icebox air horn. Tested with and without the fog cover opening (eg 60-100 - 2nd gear, full throttle). Tried to keep conditions as similar as possible - same day, same road.
Time differences were negligible so if you are chasing more power try something else. I think you need to be going faster than legal road speeds to see the benefit of ram air.
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