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Old October 8th, 2008, 11:12 AM   #1
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Tuner Question Need answer quick


i got a diablo tuner for my 03 mustang 3.8, about a month ago. i got it from a friend and it's fine right now. But i just looked up info on it and it said i should be using a 91 octane premium. i have a 3.8 v6 and i've been using regular, should i switch to the 91 octane now. and would it fuck anything up, if i just started using a higher octane now.
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Old October 8th, 2008, 02:29 PM   #2
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if you have a 91 tune on it yes you should be running 91 or higher, but the worst that will happen is a little spark knock since your timing is just a bit higher
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