I have done some testing recently on my ram air setup, and the results were interesting (at least to me). Here's a comprehensive run-down on ram air, how it has worked on my RV-7, and some recent flight tests and confirmations about the system's performance:
Excellent write-up Dan. For simplicity, I'm planning on just using the filterered air box. This confirms my choice. I just need to make that air path as smooth as possible.
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Dave Parsons, Seattle, WA, RV-7A, sold www.dualrudder.com/rv7 - building blog RunwayFinder.com - airport info, online charts, live METARs, TFRs, etc.