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bearing failure is the most common failure of turbos since there arent many components of a turbo. if there bearings are failing it should be accompanied by a roaring or slapping noise audible to the ear or at least with a stethoscope. in addition, if you remove the induction boot you can spin the propeller with a finger to check for free movent and end play some is normal but shouldnt be excessive. also aftermarket exhausts have been known to block movement of the wastegate causing poor performance. inspection of the wastegate and downpipe may reveal contact points inhibiting proper movement of these parts.

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12y ago
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Q: How do you know if you have blown your turbo in your wrx?
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