Hello SD, newbies unite....You got me curious, I found this
http://www.vividracing.com/blog/announcing-new-products-specials-and-info/2008-subaru-wrx-agency-power-intake-test/
Perhaps some other members can comment on whether they think you would feel these numeric improvements...what's the $$ for this modest gain??
FYI this test wasn't on a Boxster but a wrx, I think that car is turbocharged which skews the results in terms of applying the same gains to a Pcar..