Notice - These have moved to a 4.5 BAR In tank regulator to keep your syphon system operating on these big power return fuel systems. You will receive a regulator that will not bypass any pressure below 4.5 bar (any usable pressure number under that). 

In order to properly route a return fuel system in your NC, you'll need to block your in tank fuel pressure regulator using this nifty bit of billet aluminum. 

Remove the OEM fuel sending unit and remove the stock regulator that's exposed when you uncap the lower pump cover. Remove the o-rings from the OEM piece and install them on this one. Reinstall and proceed with unregulated fuel.