Spent yesterday converting my 2000SE to a Fuel Return and FPR type system using the M-Tuned Fuel Pressure Regulator.
M-Tuned Adjustable Fuel Pressure Regulator -6 M-Tuned
For fuel lines we used the following which we sell under our sister company K-Tuned.com
-An Fuel and Coolant Fittings K Series Swap Parts - K-Tuned
I ended up running -6 line (Larger Bore, usually good till around 500hp) from the back of the car to the front and then used the stock feed line as a return.
I can tell you that this is the way the 99-05 Miata should have come! The car is sooo much easier to tune as I don't have 60-65psi of fuel under are situations. I have the FPR set for 48psi at idle, 58 at 0psi and then the FPR adds 1psi of fuel for every psi of boost. 7 psi of boost nets me 65psi of fuel.
We made duplicates of everything we produced on my car yesterday and will be selling this as a complete kit (Fuel Rail, Fuel Pressure Regulator, Fittings, Adapters, -6 Line etc) and we will also have a version for those of you who already own our rail. (FPR, Fittings, Adapters, Lines etc)
John took all the instruction manual pictures with his good camera, so here are a few little teaser pictures from my Blackberry. Please ingore the old FMII 4 Injector Manifold. I''ve got to take it off soon, but want to port my replacement manifold first.