I'm sure with a good fuel-remap and use of higher octane (91 Premium) We should definitely see a small hp gain. Maybe +5hp to +10hp.
As it is now, from what I understand, the Mazda 3 isn't designed to use anything more than 87 Regular. You can try putting in 89 or 91, but it doesn't help. In fact, various posts/testimonials on the forum mention that it causes some annoying problems with the engine.
The computers in the Mazda3 are a totally new design that cannot be chipped. These computers are designed to be flashed via the OBD-II port under the dash, but either a handheld programmer or a cable attached to a personal computer. There are several companies working on this technology, but not for the Mazda3 specifically. I dont expect a tuner for the Mazda3 to be released until closer to the end of this year. The mazda6 has been out for over a year and there are still no tuners for it, and it uses the same computer.
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