TriPacer with Constant Speed Prop Question

Just heard about a TriPacer with 150 hp engine and CS prop ............... I have never heard of one, supposedly PIPER built 22 of these ? Anyone know if this is true or something might could have been done by STC or FIELD APPROVAL ? I would have thought it would have at least 160 hp engine as those engines had the hollow crankshaft for CS operations. What do you think ???
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