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Definitely possible to reach the limits of the oem hpfp before turbo on the M2. Not by a great deal but certainly possible. The BM3 OTS maps tend to be on the hpfp limit especially around the 5-6krpm area. There’s performance to be had over these maps.
Over in the U.K. and parts of Europe guys have installed the XDI-35 pump while on oem turbo and made gains even on 99 ron fuel.
We have also seen a m2 use the b58 hpfp which was sufficient enough to run e40 fuel and max out the oem turbo.
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