To the OP - I wouldn't bother with an FMIC. 99.9% of the time it's of zero benefit over the factory SMIC, but with significant added cost, complexity, weight, etc. Is that 0.1% of the time worth all the above?
Looking at real data - what some of the above mention is true - the factory SMIC will heat soak after a bit in a 100% throttle run through the gears, but in normal, even aggressive daily driving, it won't make much difference in actual intake air temps.
My factory SMIC would run ~10F over ambient temperatures in 99.9% of the driving I did. Even pulling a trailer with sustained 10psi boost it would run right in there. When I would start pulling a long hill or a 100% throttle run where boost is 20-30 psi, then yes, IAT's would get 30-50F over ambient.
Will an FMIC improve the above, yes - My FMIC runs between 3-10F over ambient pretty much all the time, but at significant time and cost to install. I wanted one because of my twin turbo setup and aspirations for much higher boost levels, but for your 180HP goals, my opinion is that it is not necessary by any stretch.
The whole discussion over increased volume causing increased lag - while this is true in concept, the magnitude is so small that I guarantee it's imperceptible. Let's say that you added 10 liters (doubled) to the intake tract volume for a total of 20 liters, on an engine that is consuming 900 liters a minute at idle (900 rev/min on 2 liters, but only 1 intake stroke per 2 RPM), you've added 1% to the "lag" in the system due to volume at idle. At 1800 RPM and zero boost you've added 0.5% - add in a couple pounds of boost at that RPM and the % drops even more, no to mention the increase in air density from a FMIC (albeit small at the above described conditions).