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If I can't use an open end wrench I'm going to have to bail on the STC fitting replacment. I need the truck by Saturday. I'll just have to do the egr delete and oil cooler replacement and be done with it.
I really don't know how an open ended wrench would work - it is tight back in there. Since you are removing the turbo, etc, it would probably work. Many people cut a slot in a cheap socket.
I think I'm going to leave it for now then. Truck isn't showing any symptoms of a bad STC. Was just going to tackle it while I was that far in for the egr delete and oil cooler replacement. I'll just keep the new STC for when/if I do need it.