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1989 944 Turbo Stage II chip/boost enhancer

Engine

Vehicle Information: Model(924/944/968): 944 Turbo; Year: 1989; Body Type: Coupe; Total Mileage: 56,000;

I use the car mostly for touring and occasional DE / autocross. The car has Stage II chip AutoThority Performance Engineering (both DME and KLR chips have been replaced) and a Lindsey Racing boost enhancer. At the last tune up, my mechanic said that there was no need convert the car back to stock as long as I use high octane gasoline (93 or 94). I am shipping the car in California next month because I am relocating in the Bay Area. If I am not wrong, premium gasoline has only 91 octane in CA. What is your opinion / recommendation about the above mentioned modifications? Can I safely use 91-octane gas or can this damage the engine?

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