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Converting the DV's to vent to atmosphere is a very common mod on the N54, which is well documented. They also don't use a MAF, but instead use MAP/TMAP sensors. Point being they've been doing this for years without issue. With that said...
I disconnected the hoses on mine today, allowing the DV to vent to atmosphere and then capped off the rubber hose ends that once connected to the DV's. While no noticeable difference in power, I can hear the DV's actuate much better...little flutter between a shift and a full BOV-type sound when coming off full throttle. Only issue is that once I come off WOT, I immediately get a Reduced Power Warning and I'm getting a 30FF code. I'll play with it more this evening since I'm at work now.
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'10 BMW X5///M - Alpine White on Sakhir Orange - JB4 w/ HCP Stage 2 BEF, NGK 97506 @ .20, SS tubing & BMC filters, gutted cats, AC Forged 312 22's, H&R 2"
'98 BMW 740iL - ///E39 M5 6spd swap, fully built engine (sleeved, P&P, cams), 3.46 LSD, H&R Stage 2/Bilstein HD, Magnaflow 14816's
'97 BMW 328ci - ///E36 M3 clutch & L/W flywheel, Z4///M 18's
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