It is pretty much a "don't bother" unless you are doing something engine wise - and if you are going turbo, don't bother, buy a decent ECU, and if you are modding a B20a Normally Aspirated, then don't bother, you'll be lucky to get 10hp wth any modifications before you go spending big money (on an old, relatively average ) engine, where you would also spend your big money on an ECU
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