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Just as a point of reference, I'm looking to revise the air intake for my 03 Boxster S. The Evo product looks pretty nice and would be easier to install. The 987 airbox makes sense, but is a bear to install. The price for either is about the same. For the 987 pieces, Ebay has them all, but it looks to be about $400 total, the airbox, tubes, throttle body and plenum. In my mind, the only reason to do either the Evo or 987 is to get the 74mm TB and greater airflow.
As to whether one or the other is a "true" cold air intake, the Evo looks to be sealed around its perimeter, and the 987 box is self contained. Both draw from the same source. Is one significantly warmer than the other? Dyno charts for both are about the same. Fabspeed published dyno runs for incrementally modified 986s. Eventually they ended up at the Evo airbox, full exhaust system and their ECU tune. I believe the final increase was 27-30 hp above base.
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