Not seeing the correlation between the brake booster pump and emissions / smoking. I know other BMW's / Audi's have a pump that's related to emissions (sounds like a hairdryer) - these are not related as far as I know. This is a different vacuum pump.

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Garrett Fell
2014 Honda Pilot - The *new* wife mobile
2005 BMW X5 - 4.4i - It's mine now!
2003 Honda CRV - My train car
1959 VW Beetle - My toy (13.18 @ 100.86 in the 1/4)