Hello.
I warmed up my car as usual and as soon as got on the highway I started boosting little bit I hear little weird sound. I let off gas sound disappeared. I kinda figure it was coming from one of my turbos since it was making "kang-kang-kang" grinding noise whenever I was boosting. So I didn't boost my car all the way to work. As soon as I got off work I warmed up the car again and tried to boost it again this weird sound wasn't there all the way home.

It kinda sounded like there wasn't enought oil going into turbos, but I am not sure what happened. I have non-sequencial set up and have had rebuilt both turbos about 2 years.

Any recommendations or thoughts?