Check out General Sales Saab/Cadillac - last I heard (when I worked there) there were a Hirsch Dealer and HAVE the tune ability. Call up Paul or Harry in Parts and deal with Neil in the shop - they will take very good care of you! They are located in West Chester, PA FYI
Wish we had that stuff @ Fred Beans in Doylestown.
Other option - contact John Williams (JZW Tuning) and see if he can help you out with a tune.