Personally, I wouldn't.
I've had Eibach lowering springs on my previous 9G Civic 1.4, and whilst they were worthwhile there, with a manifest handling improvement, they led to frequent scraping / height concerns, even with a very modest drop.
I couldn't bring myself to touch the suspension on the FK8:- It's been setup with the explicit purpose of "Fast road and track" and they've done an excellent job of it:- There are plenty of places where I'd scrape in my previous car that I can continue without worry, which is rather refreshing.
Furthermore, the highly integrated systems make lowering rather more problematic:-
From the service manual, you can see there's a stroke sensor on each of the wheels used for on-the-fly adjustment of the active dampers. With lowering springs, you'll be taking the dampers "out of tune" (Once again, I could feel this in my previous "Boggo" civic with lowering springs, and whilst I wouldn't say it's a major complaint, it becomes a niggle every time you notice it) - Not to mention the fact they're also linked to the headlight levelling system et al.
In all, Personally, I wouldn't do it.
There's a visual improvement, but there will be a performance sacrifice in terms of damper tuning (Really not dreadful / terrifying / crash and die, but niggling if you notice it) and ability to drive over speedbumps / potholes / steep ramps!