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Yes, you would need to unbolt the headers from the Y-pipe in order to remove them.
I would highly recommend removing the headers, as there is just barely enough room to work under there with them on. Although it's possible to do it with them on, it's extremely challenging in both dexterity and patience to get the cooler assembly back on without screwing up the alignment of the cooler parts inside the housing, not to mention holding the darn thing on the block while trying to maneuver the first bolt into the hole without cross threading it (very easy to do in aluminum), and without really being able to see what you're doing, and barely being able to fit both hands and a bolt under there (holding the bolt with 2 fingers and dropping it a million times), and....well, you get the idea.
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky
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