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You can take the compressor housing off and see how gunked up it is and if the vanes move freely or not. It doesn't take that long to take a look. I would be more concerned about why someone would remove a 'completely fine' turbo just because it doesnt whistle anymore?
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03 F250 SD Crew, Fx4, Lariat-150K
02 Coachmen Catalina 267 GSX TT
02 F150 XLT Super Cab-105K
86 Porsche 944 Turbo, Garrett DBB-189K
87 Porsche 944S-183K
07 Toyota Highlander-27K
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