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I have done the remap on my 23i, and to be honest, I doubt is only a placebo. I am happy with the gains, 17-19hp, something about that. Not a lot, but made the car more responsive, especially in 1st and 2nd gear.
Cost was 300e
Don't forget to change your ignition coils, I had one or two not working well, and the engine was underpowered, no errors on the dash. I found out that only while having the car on the dyno.
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