I saw an install at a show with the Spectra tank that had the regulator on the body just ahead of the tank where the line runs. The return run was 18" or so. He was running a chokeless 4150 of some sort. He had split the output after the regulator to run 1 line to the carb and one to the Nitrous plate. Adjusted initially to 6psi and with fuel flowing into a catch can through orifices that matched his nitrous jetting and and needle/seat orifice flow, then jacked that pressure a bit to keep it fed up top (6.6psi at both the plate and carb inlets. The guy stated that adequate fuel supply and pressure was not one of his problems.

Anyhow, pros/cons of that setup? The packaging is tempting....

Car was a small block brand-X auto with ported factory heads of some sort, headers, 9.0:1, cam, converter, ET Streets, etc. 150 shot. A fairly conservative setup as these things go, and clearly a driver with strip time on it. Not super shiny and with some timeslips getting close to 10's.