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EDIT: I just realised that according to your screenshots the Ta-152 already has a DB603LA engine, intriguing.

...FM say DB603L with 1665hp.......and Ta152C was not low alt version....it was low alt compared to Ta152H because it flew best at 9000-9500m.......it did not have GM1 because with all that power (2100hp,2300with mw50) you don't need it ....