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TP-38 series. I think all the turbo PSDs used a variant of it... slight differences in the housings, mounting flanges, etc. (please correct me if I'm wrong).
The stock 99.5+ Garrett GTP-38's use a 1.0A/R intake with a wastegated .84A/R exhaust housing. The PSD vans use a non wastegated 1.0A/R exhaust housing.