EMG's & the 18v mod, does it improve output?

I’ve been intrigued by the idea since I stumbled upon a demonstration on www.youtube.com . The sound quality wasn’t that great, but there is a lot of topics about it if you google it.
For those who are confused…. EMG’s are guitar pickups that are pre-amped at 9volts, for some extra umpht. The people that “have done the mod” say it increases dynamics and larger headroom. EMG says, the pre-amp circuits are capable of 27v, but only recommend going up to 18v. So, has anyone done it?