Does anyone have any horror stories having the dealer install a supercharger kit?
Anyone have any really positive experiences?
Having a dealer do performance work seems like it has some risks.
Is there a good Mustang shop in your area? Would you be willing to drive one or two hours? Does the dealer (actually, Ford Racing) provide a warranty if the work is done by the dealer?
Is there a Mustang forum in your area? Maybe one of the members can chime in about the installation (by himself? by the dealer? by a shop?).
Last thing I can suggest is that you stop by the dealership(s) and have a chat with the Service Manager. Ask him how many installations they have done and if there have been any problems?