I've got a 200SX coming in soon, the guy popped in at the weekend. He bought a 'Genuine Garrett' turbo off Ebay, fitted it that morning, but it had begun making lots of noises and no boost. I booked it in for us to look at it.

He called this morning to say that the turbo had properly shit itself. It had been fitted for 2 days.

I told him that I have my fingers crossed for him that the failed turbo hasn't passed through the engine and wrecked that.

Moral is, get it done properly IMO.