[DenverSteve]

I'm not a Boxster "expert" but I have owned two and never had any uneven tire wear regardless of tire type. Unless you are completely confident in your tire person's ability, I would take it to another shop. You may have a racing suspension installed which would have a different camber set than a street set up. If so, unless you want to frequently replace tires, I would change the suspension to a set up more in line with your intended use for the car.