i have had one for around 2 years now. the probe is in the collector of the manifold before the turbo. even before i went to the 8mm M pump i could get hot enough to have to let out of it. as it is now i cruise at around 550* doing 60mph on flat ground. theres a local hill a few miles long i like to pull around 70mph my egt stabilizes at around 1000* pulling it. all this is with the larger turbo, intercooler, and 8mm pump of course. i have hit 1700* once during a race at around 120mph but that was at 6000 rpm where the ve of the motor goes to crap.

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1985 300D om617: 8mm M pump 175cc 5200rpm, holset he221w @ 30psi, large A2W ic, compounds on the way.
KD9AFT
A&P