Also keep in mind the AC Vacuum goes through a check valve as well..

don't forget that piece or your AC will do some funky things with the vents.

on my Miniram I used a Plumber TEE and split the PCV and Fuel Pressure regulator

 

Let me see if I can accurately describe what is going on in the TPIS MR fuel rails:
The fuel rails supplied by TPIS have two rectangular channels when they are originally extruded. The two channels are stacked one on top of the other. The lower channel feeds the injectors, while the upper channel is merely a transfer port. On the R side (feed rail), the lower channel feeds 8,6,4,2 injectors, then the fuel makes a 180° turn and returns down the upper channel to the rear of the car. The upper channel in the rear is drilled to allow fuel to make a 90° turn into the 1/4" transfer tube across the rear of the MR. The transfer tube discharges into the L fuel rail upper chamber by making a 90° turn (fuel is now travelling forward on the drivers fuel rail). The fuel then makes a 180° turn to the lower chamber in the L rail accessing injectors 1,3,5,7, then makes a 90° turn into the AFPR where it discharges to the return line.

The mods I have detailed on the fuel rails (while retaining the TPIS supplied SS fuel lines) are:
1) remove both fuel rails from the MR. drill through the upper and lower chamber wall on the feed end of the R rail, and on the discharge end of the L fuel rail. This will allow both rails to be fed simultaneously and will not affect the function of the AFPR. This mod allows both chambers of the fuel rails to feed the injectors (more volume equals less pressure fluctuation from injector to injector).
2) drill and tap the L and R rails transfer tube ports to NPT sizing to allow a -6AN hardline (with flare nuts) to connect the two rails together. This removes the restriction of the smaller design transfer tube. However, more importantly the mod removes the o-ring seal transfer tube from the system, as it has a tendency to want to shift and leak fuel past the o-rings when fuel psi is spiked (i.e. WOT, FMU, etc).

I hope this helps,
Aaron