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Lt. Commander
Join Date: Dec 2007
Posts: 120
As it says in the title.

At least from STOwiki (which I'm... cautious about heeding), the best appears to be the Efficient Impulse Engines, at possibly +7.5 as Mk X.

But A) not sure if that's accurate, and B) not sure if any of the other engines (particularly set ones) top off higher.