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Ask for a guarantee and a dyno proof
Most one size fits all flashes affect throttle response making it more sensitive and thus affecting negatively fuel economy. They also change the rev limit upward. Not much gain.
A good flash after all other mods have been made can be complex. I've known one expert with almost unlimited resources and access to the source code flash writers to spend dozens of cycles of flash, dyno and drive, then come back again and adjust and do it again before being satisfied with driveability, economy and power (and a match to available fuel octane quality).
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