Hey freaky986, I'm considering something like that (bore out a 3.2 to a 3.4 or 3.6) too. The actual boring of the cylinders is not really an issue. I'm more concerned about getting the appropriate pistons and crankshaft as there seem to be little or hardly any aftermarket ones around. Not to mention fuel injectors and cams
Where do you intend to get these? There's also the dimensions of the cylinders to consider the 3.4 or 3.6 ie. the ratio of stroke vs diameter of the cylinder
That's why I'm considering using 'out-of-the-box' tuner houses solution from likes of 9ff, TechArt which unfortunately no one seems to have much experienced with.
But once you get past these things, it's just putting the motor back in. I'm hearing from a few that a 996 lump will not fit in easily into our cars. Something about it being mounted 'the other way round' in the 996 so some amount of work needs to be done to get it into the Boxster. Not to mention different electrical wiring