Sounds like normal spool down to me ... my first comp turbo had a very distinct sound and I thought something was wrong but it was just breaking in at around 10k miles ... I did have a issue with the zerk fitting O-ring leaking coolant ... so I sent it in and got the updated version that eliminates that issue .. second turbo is following same sounds as the first and is almost fully broke in .. but to be sure I would remove the turbo and verify the blades are not damaged or and binding and see how it spins by hand .. if there isn’t any signs out the ordinary ... put it back and keep boosting
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