Ok i swapped out turbos the other day and i was looking at the old one tonight getting ready to put it on ebay when i saw the end of the Exhaust shaft. It looks like it has been rounded off. It has run fine ever since i had it on the tuck. It has never made any noise or anything. When i had the Banks kit on my truck i did notice that when i let off the go pedal quickly the turbo would make some noise. i dont know if this could have been related or not. Once i put the DD box on i never had trouble with that noise. When i took it out it was all black so it has not rubbed in a while but i am pretty sure is has before.