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Message: [QUOTE="2000wa250, post: 1034941, member: 3399"] Pulley will not change the vacuum IMO....I'm a bit fuzzy, so.could.someone remind me what 1-3" of vacuum roughly translates into psi? I don't see how 1000 more rpm out of the blower on average will build enough psi to give you a positive pressure in front of the turbo... If you respond with your goal isn't to use the blower as a true compound, but instead are simply using it for better throttle response, you could have saved a ton of time, money, and pain in the ass by simply putting a tighter housing on your turbo [/QUOTE]

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