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Following up on this...
I have several cars making significantly more horsepower that stock on OEM Z4M pumps. One in particular is running full E85 and is putting down 540 whp (essentially 700 whp worth of fuel flow on pump gas). The stock pump has capacity for almost any forced induction setup. What remains to be seen is how long it will last with the low lubricity characteristics of ethanol. I believe the Walbro 400 is rated for gasoline only, while the 450 can survive in E85. I chose to upgrade my fuel pump for longevity reasons.
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