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I wouldn't try to put the egt in the manifold (if it's just the probe sort). I doubt there will be any appreciable difference in the reading a few inches down the pipe. It's a little relative anyway, you'll have to do some mental calibration once you get the Porsches actual temp specs. It will help to get the probe tip centered in the pipe as best you can though.
I put mine a couple inches behind it in the pipe. If it not late, you might trade yours in for the kind I have. It just took a few minuets under the car. There like a hose clamp. if you looked at the end it's like a "Q" where the leg of the "Q" is the probe and circle of the "Q" is the hose clamp that clamps it on and seals it up. Drill a hole in the pipe, tighten down the clamp, run the wires up, done. (If yours is threaded , you can buy a threaded stainless bung (ebay) and have a muffler shop weld it on to the pipe.)
Ya I forget which, MAF (mass air flow) or MAP (mass air press.) are on these, doesn't matter though, either one is just putting out 0-5v signal that reflects how much air your sucking in to be mixed with the fuel. It definitely won't hurt SMT6, and for data logging, it ...none invasive.
Good work, PK
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