Look at the alignment specs in the owner's manual
and you'll find they allow for a variance. The good shop will ask you if you want a racing setup or a maximum mileage for your tires setup and know what the settings will do...probably because they set up Porsches for racing and so they know their stuff. Any fool can set the Boxster within the specs...and a good guy will know what effect one end of the spec will have as opposed to the other.
I got mine set up by someone who knows..who asked me what I wanted. 16k later I still have maybe 5k more tire wear on the rears. I got the setup I wanted. Didn't cost me a bunch either. But saved me probably $500 in tires.
So you pays your money and takes your chances....
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