EGT question?
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You will get alot of different answers on this. You can do it both ways though. I've done three trucks with the turbo still on with no ill effects. What I did was put white lithum grease (thick and sticky) on the drill bit and (sharper it is the better) drilled at a low speed and the grease caught the shavings. Then to tap it I did the same thing with the grease. Then with the probe still out i started the truck to blow what might had dropped in out. Then installed the probe.
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Never took mine off either. Had a buddy stand with a shop vac to suck up all the chips as I drilled. Then used grease on the tap. Stuck the little magnet through the tapped hole. And then used some grease on a q tip to catch any little chips that may have bene missed (yes thats kind of extreme). Worked great for me.
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I just pull the center section & cold side as one unit off the turbo leaving the turbine housing and downpipe still connected to the manifold. Drill & Tap, blow out with air, pop the loose half of the turbo back on and go. Leaving it running works fine...I'm just a little too cautious maybe.