My 2 cents worth.
Yoshimura R-77's.
I think they really suit the ZX-14 looks wise.
And the sound is a nice balance of volume and low growl IMO.
They also come with baffles so if you feel the volume is a bit much (which would be surprising), you can quiet them down.
I have titaniums with carbon ends and baffles out.
You can also get chrome and full carbons.
But then it's really up to the individual as the look and sound of after market pipes vary so much and what looks and sounds great to some doesn't to others.
The only standard is the vast majority don't like the stock cans, Gen 1 or 2.
Good luck and post pics on what you decide on...

* Last updated by: yannih on 2/17/2015 @ 1:39 AM *
2012 Metalic Spark Black Kawasaki ZX-14R.
Yoshimura carbon R-77 slip ons,Custom dyno ECU flash,Striker rearsets,Hyperpro RSC steering damper,HM Plus quickshifter,ASV C5 levers,Hel SS transparent red front/rear brake and clutch lines,Kawasaki/MRA vented spoiler screen,Carbon heel guards,R&G radiator guard,Powerbronze carbon rear hugger,ZX-10 front fender with fender extender,Yoshimura frame sliders,M-Factory rear stand stoppers,Escort Redline radar detector,Techspec tank grips and tank protector,Versys 1000 fender eliminator,Kaoko cruise control,Moto red oil cap,Oxford heated grips,Red magnetic oil drain plug,Red and black Bagster Spider rear seat bag (for touring only).