Fuel octane does make a difference, that's why the UK FK8 makes more power than the US FK8.
But in this case I wouldn't bother retuning a stock B18B1 for it. Get some bolt-ons and then tune it for 91.
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I get what your saying bro, get some 16x7! They are great size, shouldn't rub, and it'll handle better than the stock 15x6.
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