I would replace your feed line. Friend's car killed two stock turbos in a fairly short amount of time. One came on the car like that, the other did the same thing yours did- horrible metal scraping sound on the way to a meet. Both had horrible shaft play gouging the housings and bad bearings. Replaced the stock head feed with an aftermarket feed from the filter housing and replaced the drain tube and his new 16g is still doing fine 6 months later.