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I believe that Porsche requires every one of its dealerships to have the Hunter road force balancing system in house. Also, there are a fair amount of independent shops and "tuners" that have their system as well.
p.s. If only you lived closer to the Northeast. I have a few sets of spacers that I would be more than happy to let you try. I am convinced, that at the very least it would improve your situation, if not remedy it altogether.
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