It is illegal and can be done just like anything else by someone with the ability to solder electronic components and access to ready made ecu chips for your year/make of car or schematics for the chip.
Not worth the investment or the trouble if you ask me.
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Tune (by Seb@SpecialtyZ) -- Upgraded Parts List : When in doubt, use brute force; if it doesn't work, you aren't using enough.
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