you have to call their customer service since the special is 5 qts + a bosch filter, and there's no boxster filter that's part of the deal.
if you have another car and want to use their filter, just add the oil, then get the bosch distance plus filter for your other car.
the cart will then update with the discounts. the filter goes from $13.49 down to $8.57. the 9 qts of oil go down from $80.91 to $51.39 ($5.71/qt)
i tried it with a local newark, nj store and it still works.
