GM Engine & Exhaust Performance EFI | GEN I/GEN II/GEN III/GEN IV Engines |Small Block | Big Block |

9psi on a 4.8?

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Old Jun 23, 2005 | 04:36 AM
  #21  
Launching!
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Sounds good. I will check it out as soon as I get a chance. I have been noticing an extra little whistle when I'm on it a little. It just started recently, but I've had the low boost problem since its been on the truck. Maybe my bypass valve might be getting worse and now I'm starting to hear it now.
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Old Jun 23, 2005 | 11:56 PM
  #22  
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Tribe Shaman
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From: Texas
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as soon as you plug the hole on the pressure side, get ready for max boost, that small whistle sound is the valve letting your boost go, it has a very nice hum to it.
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