If you want to go the software route, I'd recommend Revo. I'm currently working with them on a custom map for my LN based X51 3.8 and am also discussing some added functionality to the map, in particular, by having the DME turn on the radiator fans at a much lower temperature. The other cool thing about the Revo product, is that it is tuneable to adjust throttle tip in, ignition advance, and possibly even have some authority over the VarioCam parameters. So, if/ when we can get better fuel, there is the option for more performance there without having to do a whole new flash.
As to the nature of the sleeper Boxster, it is cool. This car makes close to 400HP and it is truly enjoyable to watch the faces of guys with "better" cars when you pull on them
