Motor has just under 60K miles on it. Internally stock w/ Injen CAI, JDM ITR header, 2.5in exhaust w/ Mugen twin loop exhaust, Mugen N1 ECU.

First of all, how does it look power wise? The cross over looks horrible, but not as bad as some I've seen. Leans out a bit from 6K-6.5K but is nice and rich (read safe) from there on. I'm sure there is more power there w/ some fuel tuning at least. I'm not married to the ECU, came w/ the car when I bought it. Ditching it and going Apex-i or Hondata would probably yield gains. Anyhoo, any educated feedback is appreciated

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I would expect it to be higher.

Try a different ECU and see what happens. Does mugen offer ECU adjustment for mods like many VW tuners do ?