I have a 92 240sx with an R33 RB25DET series 2 engine. I have been running it for the past month. But for the past 2 days i have noticed a whining when the turbo only starts spooling. Im not going to lie, I have been running the car hard. The other day i was going real hard on it and it already had that whining so it seems that its not affecting my performance, but by the end of the day one of my friends noticed a white smoke on my muffler. i know that white smoke means coolant is being burned. If by any chance this turbo went bad, whats my best choice
? rebuild the turbo? or get a new one? i don't plan having huge power. My plan is tuning this engine to the best. Can someone help me please? If i am misleading myself please correct me.

Thanks in advance