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This page has some hints:

I am not certain these guys are still around but their recommendation was to fit a modified Cadillac 4.5L in order to maintain all pollution controls and dash indicators.  I also like their descriptions of things they regularly mod in rebuilding the HT4100 in order to build reliability.


2016 Cadillac ATS-V gray/black; 2013 Cadillac ATS 2L Turbo Premium (Wife's)

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