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Diehard (not verified)    January 26, 2017 - 2:50PM

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What I'm not too sure of is why when you race the Scat Pack engine while in Park doesn't soumd as loud when at similar RPM's in Drive.
Is that butterfly valve in the exhaust pipe "fully open" in both scenarios?
In other words, is that only Fully Open or Fully Closed?

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