[chaudanova]

I've got a set of 18" Carrera 996 Turbo Twist wheels with Pirelli Pzero tires on them in excellent condition if you're interested. The offsets issue: the fronts will fit just fine...the rears will fit with spacers. (I also have a set of H&R Trak spacers that will allow you to fit these wheels to the boxster)...

And to answer your question, porsche made both offsets... Some of those wheels came optional with the Boxster offsets... you can run the 911 wheels on your boxster, fronts direct fit, rears with spacers...