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Looking at how the m3/4 vacuum pump is configured it's similar to n55 unit but with 2 HPFP "ports" as opposed to one.
Plug in connection into vacuum body is the same part between S55 and n55 so not sure what electronics are needed to control a 2nd pump when they are driven off same drive shaft within vacuum pump body.
Both HPFP then tie into the same fuel rail so HPF sensor and regulator sees and controls rail pressure in the same way surely ?
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Fettled M135i EB AT then AW M2 DCT - both gone but not forgotten:
Current '22 X3M LCI..
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