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I'll be of no help here...
Posted by Bob Davis (more from Bob Davis) on Tue, 21 May 2002 18:51:15
In Reply to: Full boost produces "screamin' banshee" noise--normal?, Percy, Tue, 21 May 2002 10:56:23
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...but my '91 9KT did this, but only before the engine was fully warmed up. I never subjected the engine to full-throttle acceleration until thoroughly warmed up, but even at part throttle when some boost was evident a "screaming banshee"-like sound would be produced. I never could figure out the specific source of the noise, but always assumed it was a leak, as it would disappear when warmed up. To my way of thinking, this fact pointed to a leak suppressed by thermal expansion.
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