Pitch sound in gears

[El Supracabras]

It's easy enough to look at the turbo, pull off the accordion hose and check if the impeller is chipped, contacting the housing or sucked in something. I've have experienced supras make funny turbo noises for 2 other reasons. 1) improperly installed garbage manual boost controller (high pitch howl under boost) removing the controller and connecting the compressor nipple back to the actuator solved this 2) big hole in compressor discharge hose (ran like hsit and sounded like a space ship) replacing the hose resolved this. Both cars saw lower than normal boost while this was happening.