Compression Ignition Addict
Join Date: Jun 2011
Location: Colorado Springs
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Screaming is not good. A hissing sound is an exhaust leak. Screaming sounds like turbine to housing interference. Pull the air inlet and see if there is excessive end play or side play (or contact with housing) of the compressor wheel.
Low boost can also be caused by stuck VGT vanes, exhaust leaks, or a stuck open EGR, or a bad turbo. The first three are pretty much free to check for, just need to get the hands dirty...
2005 F-250 6.0L, crew cab, long bed 4x4
completed in 2011: STC update, new IPR, BPD EGR cooler, oil cooler rebuild, 6.4 banjo bolts, blue spring update, SCT X3, Insight CTS, 58V FICM, CCV Mod, DIY coolant filter (now gone), refinished turbo
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2012: ARP headstuds, OEM gaskets, standpipes and dummy plugs
2015: XDP coolant filter