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R33 GTR has two O2 sensors. I just changed my turbos for HKS items recently, and by memory, it was a 17mm Flare spanner i used to get the O2 sensors off. You could probably use an open ended spanner too. Just make sure you put the right ones back in each dump pipe. One has a wider plug than the other. You will have to take all of the piping off the top to get to them. ("Twin Turbo" pipe, rubber hoses, etc.) One at the back is awkward to get to.

Hope that helps.

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