I mounted on my EMG Ibanez a month ago now, I'm very happy because it gives me better sound than my old pickups, BUT they generate against by many more blows a passive pickup. I tried several guitars mounted original EMG and all with the same problem of breath. And it seems logical for these mics have a built-in preamp. So all those who say that the EMG does not generate a breath, it is pure fantasy.

If you plan to buy EMG thinking they produce less than a micro passive breath, then look elsewhere.
I find the palm muting with fairly average EMG (matter of taste), but otherwise it's big sound.

[edit] Do not confuse the breath and the background noise (for indeed the electronic microphone removes parasites by definition), more than I did a test with just the jack and the microphone (and the battery of course) without mounting it on a guitar, and the same breath is perseptible. I even try with a micro nine, after, and always the same breath. Even my 85 produces the same breath (test on multiple amplifiers with multiple cables), however, a good noise gate will do (what I use)

I want to say I use a cable ProCo Excalibur very high quality for my guitar, and all my rack is wired Proco too.