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Too cool!
I'd also suggest:
--> Experiment with increased EGR (cooled, preferably). Find the limit of driveability.
--> Quantify efficiency gains from an electrically driven water pump.
--> Got an extra set of valve springs? Likely too small to be seen on a dyno, but some efficient engine designs run with reduced spring tension.
Also, I'm sure you know this, but the warm air intake is *supposed* to reduce engine power. The wider throttle opening required to produce a given amount of power is where the supposed efficiency gain is found (reduced throttling losses). Similar, in a way, to EGR. Unless it messes too much with other factors (timing, in some cases).
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