So far no one has found plungers between 5.5 and 10mm for the MW pump. 10's seem much to large, and the stock 5.5's cannot deliver more than 200HP it seems, and no one in the USA has hit that figure yet with a dyno any of us have seen posted. A simple change to a M myna pump with no other changes puts a proven 140 RWHP, and plenty left over from the pump if you want it. A myna pump is about $2K. This is all for a 617-95X.
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