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It's easy to overthink this stuff and get sucked into the marketing hype vortex.
Back in 2005 there was a lot of independent dyno testing going on to compare different intake airbox designs. The airbox should do 2 things well: Let plenty of cold air in while keeping the hot air and bad stuff out. As I recall these were the basic results after a LOT of testing:
Stock 986 airbox worked fine on a 2.5L
987 airbox added 1-2hp primarily on 3.2L models
Cone style EVO filter inside the engine compartment lost 2-3hp due to higher intake temps, and rapid oiling of the MAF sensor caused the engine to run poorly. It was discontinued.
Boxster Spec Race cars all run stock 986 box and (I think) stock paper filters.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
Last edited by Topless; 02-13-2020 at 07:38 PM.
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