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I am considering doing this mod to my m54, but it is my understanding that after this mod, the vacuum at idle will be substantially higher than the stock design. I use my car for work, and during the summer I have to idle at quite lengthy time periods. Would this cause a problem for me? Would I need to also use an adjustable vacuum relief, possibly tied in to the F pipe on the intake duct, so there would not be unmetered air being introduced into the system?
 
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