But I would disagree about the ultimate gains acheivable. The current model has 240hp and I believe 197 tq. They did not change the internals of the engine, including cams. They did enlarge the throttle body, add factory manifold (header style) and ecu changes, as well as intake manifold changes (how much I do not know since my 04 has the flapper style intake as well). I believe it is made of plastic now which may help the intake temp a bit.
All relatively subtle changes for 240 h.p.. Is this the last evolution of this motor power wise (no way). But remember Porsche does not want to spend a fortune on exclusive parts and tuning for just this mill and they have noise regulations and blah, blah you know to deal with. Can you make it smog legal sure. The headers will delete the pre-cat but if you use dual o2 cats that are at least 200 cell and get the ecu tuned properly a/f ratio. You should be fine. The pre-cats are for some tailpipe bag test only (not sure what that's about). Ultimately the sniff test on the dyno tells the tale.
I also think unichip is pretty reliable so there dyno numbers along with the cold air intake from scargo should be very close. Of course we all know about the power range of these motors from the factory right (they differ) some are stronger than others. Perhaps the best combo is Intake, Headers, ECU.
P.S. I think this is a great topic and Boxster tuning is just getting it's feet wet. I hope we can someday get a reliable supercharger kit or a less expensive turbo kit 24k is ridiculous. Don't get me wrong the Boxster is a great car but I noticed recently how the power really flattens out past 6k and we have 7200 to work with
