Hey Yeti, My whistle also diminished to a point where it was barely noticeable with the vac line disconnected. At first I thought it was the boost actuator diaphram(the can on the turbo where the vac hose attaches) leaking. However after further investigation, I realized that by unplugging the vac line, the trubo was not creating as much boost and therefore not forcing backpressure out the manifold gasket leak.
Cheers
PS. look for soot build up under the manifold heat sheilds and the head. I found this near the front of the manifold behind the viscous heater.
_________________ Hers- 2005 Stone white Sport, KJ CRD - Third owner, 169,xxx Provent, EGR system removed, ID Parts silicone hoses, Fumoto, V6 air box, V6 A/C condenser, Ram 1500 transmission cooler, OME 2.5" lift, 235/70/16 PO Yoko's
Mine- 2005 Stone white Limited, KJ CRD - Third owner, 180,xxx; (under a tree waiting its turn to be revived)
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