I think this question is answered in the 'inside the dme' thread, looks like number 9 is the part I'm looking for?:
9. T504 - The Ignition driver transistor. Labeled 1012 in the schematic and on the part itself, it is thought to be similar to a ST BU941 (Bill in OKC on Pelican made this connection and it seems to be the case looking at the data sheet for the BU941).
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1989 Slate Gray M491 911, Garret GT30 Turbo 360hp.
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