Hi guys check out my free App made specifically for the nexus 5.
The Nexus 5 Real Volume Booster will create a custom mixer_paths.xml file for you, which will allow you to increase the default maximums for headphone and speaker volume.
Note: (You need a custom recovery in order to install the file)
The free version has a 4.3 rating on Google Play with over 7000 installs
The free version has all the same features as the pro. The PRO has no ads and you help support my work.
Free version : https://play.google.com/store/apps/details?id=com.n5rvb.nexus5realvolumebooster
PRO (AdFree Version: https://play.google.com/store/apps/details?id=com.n5rvb.nexus5realvolumeboosterpro
XDA Thread: http://forum.xda-developers.com/google-nexus-5/themes-apps/app-nexus-5-real-volume-booster-t2688313
Let me know what you think.
Thanks