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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
02 Coachmen Catalina 267 GSX TT
86 Porsche 944 Turbo, Garrett DBB, scary fast
87 Porsche 944S, not so scary
07 Toyota Highlander, puts me to sleep
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