Went back for more pulls with Seb@SpecialtyZ today to see what gains were made from the Motordyne M370 manifold.
Gains in TRQ and HP were made from 3K RPM to about 6.5K RPM as advertised. The Z did lose 2 Peak HP, no biggie.
Largest gains were seen from 4.5K RPM to 6.5K RPM, in some areas over +10 HP & TRQ.