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the cai in the boxster is an oxymoron - the box already has a cold air intake (ps, even with snorkel removed, the intake remains sealed from hot engine air).
the aftermarket units don't seal and will draw hot engine air in, reducing performance as a result. further, a bit of research will show that vendors of cai's (evo, etc.) market the same unit for the 2.5, 2.7, 2.9 and 3.2 and use a common mass airflow sensor housing. strangely, the 2.5 and 3.2 have different maf housing diameters, so you start screwing with the ecu's ability to adapt at this point.
what you want to do is reduce restriction to air intake. cai's do this, but the cost and other side effects are not worth it. instead, remove your snorkle. change the pipe between your throttle body and air box. replace your airbox with a less restrictive airbox from a cayman/987. get a larger intake plenum and/or throttle body (997 unit, ipd, softronic). this will all reduce intake restrictions, keep the air cool, and not detrimentally affect intake tuning.
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