i have 31,000 miles of which, 20,000 miles on my car with the FM kit. I myself have been to visit FM's shop. The people there assured me that the car would run well over 100,000 miles on the existing setup. They have testimonials from people with Miatas that have nearly 200,000 miles on the odometer with zero turbo caused reliability issues.
If you are running the FM kit with the fuel pressure regulator provided, you will be safe to run 6 psi on 91 octane. The kits designer, Corky Bell (of Maximum Boost fame) has stated that he believes 8 psi is perfectly safe on 93 octane or higher. Regardless of this, the protege is going to be FM's wintertime "project car" so to speak as they look for thier own fuel and timing solution akin to what they have done for the Miata.