The 125i has a bigger displacement than the 118i and a larger bi turbo (125i has the same engine as in the 328i only with different size exhauste to restict it to 160kw) If you fit a 75mm+ tuned exhauste to a 125I you get 210kw. In threary, if you upgrade the exhauste to 90mm on a 125i you will be able to use the M chip (mapped) for the 328i when released and punch it out to 255kw
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