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The vacuum line runs from the engine bay all the way to the trunk, tees into a sensor and then vacuum lines run to the valves. Leave any of those unplugged and you'll notice an instant decrease in power. I kept having reduced power warnings (found out it's a different issue), but had assumed my exhaust lines we're capped properly. For anyone who wants to test it, unplug a vacuum line from one of the vacuum canisters in the engine bay, drive away and it'll feel like you don't even have twin turbos.
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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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