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While I was doing my previous turbo repair (see: https://www.ford-trucks.com/forums/9...-both-ugh.html) I found this part laying basicly on top of the EGR cooler. For the life of me, I can't figure where it came from. It did not appear to fall out of anywhere while I was in the dis-assembly process, it looked like it has been there a while. It is brown viton.