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Depends on how much you want to take apart.
You can do the IPR without removing the turbocharger if you have the proper socket. If you make your own out of a spindle socket, you will not likely be able to get it to fit with the turbo/intake/etc on.
What I would do, if I was you, take the turbo off and use a wrench. I believe it measures out at 1-7/16" if I remember correctly.
As for the tool to air the system up, I have another suggestion for you. If you're going to have the IPR out, turbo off, I would put the updated one-piece STC fitting kit in it while you're there.
The reason I say this, is because in this kit comes a small chrome plug that you can drill a hole through and fabricate your own air-leak tool out of. That little plug screws into the top of the HPOP, but the thread pitch and size is the same as the ICP sensor in the valve cover.
Alternatively, you could take your ICP sensor to plumbing shop and see if they can match 'er up.
Hope this helps.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
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