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I agree that on a naturally-aspirated car, a K&N filter isn't going to do anything for performance, if that's all you've done. Even with a full exhaust, it's not going to do anything. However, if you do major mods like a turbocharger or supercharger, then yes, you're going to exceed the flow rates of the stock filter.
Of course a K&N lets in more particles. There's really no reason to use one unless you've done big, beefy mods to the car. And, if you've done that, you probably aren't as concerned with having the engine make it to 200,000 miles as others might be.
It's a really common modification to do to many other cars, and has verifiable benefits--like on my Eclipse, which came turbocharged, you pretty much have to use an aftermarket air filter of some sort in order to get enough flow once you've swapped out to a bigger turbo.
I see no reason to put one on a Boxster, so by that merit, is it worth risking destroying the MAF sensor?
On that note, I'm surprised our MAFs are that sensitive. My Eclipse has used a K&N filter for over 120,000 miles now and the MAF is fine, along with the engine which doesn't seem to have been perturbed by the extra particles in the least.
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