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You can just plug the vacuum lines with a golf tee. This is actually called the 'Golf Tee Mod' in 3 series land.
The valve is simply to reduce drone in the cabin at 55-65mph. You will not throw a code.
Please let us know how that new cat back sounds. I'm contemplating it.
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2006 E90 330i (retired)
2009 E90 335i (retired)
2012 E70 X5 50i M Sport (retired)
2016 F10 535i M Sport
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