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i called ford performance people they told me if you get the FP tune you have use 93 , if not would damage engine. Im newb so i dont know ShEt but that what they said

This has probably been asked in this long thread. I talked to a speed shop about this they said will probably fail California emissions ? is this true. Second Cal has expensive gas does this tune require higher than 87? , the person I talked to at Ford said yes. $10 more a tank sounds like...