75 shot ok?
If its running normal and nothing is wrong with it, your car will have zero issues with a 75 shot. Just use the normal safety devices and you'll enjoy the extra HP.
.....But I just read your sig... so now my suggestion is to go to the dyno and check AFR to ensure you have enough fuel. You wont need the 100 octane.
I have a efi live data logger that was planning on using with my test runs to check to air fuel to make sure its good. The car already runs a lil rich on Na tune. And I have a fpss and window swith for safety but I'm just still a lil scared to spray it because I'm not pulling timing. That's why I thought I would run the 100 octane
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