I've heard that none of the exhausts offer any more hp and that some even lose a little hp. Personally, I figure it's all zero and comes down to what sound you want. A "Fabspeed" Dansk for $627 sounds like a smokin' deal. I wish I could hear all of the different exhausts in person as I would like to bump up the db's a little too.
One name I haven't heard mentioned too much in the Boxster world is Supersprint. They have a great reputation in other circles. They have a dual can system for the Boxster. Does anybody have any experience with Supersprint?
http://www.supersprint.com/a_prodotti.asp?modello=pobox3
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