Compression Ignition Addict
Join Date: Feb 2007
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ITP regulated return and FASS run you both about the same as far as parts price by themselves. RR kit will increase pressure, but it does something that it's even better at and that is it makes sure that there is a constant supply of fuel to all 8 injectors, particularly those in the rear.
I would(and I am) run a FASS system with a RR kit as the FASS system doesn't do as good of a job of dealing with the dead-heading(rear injectors not getting enough fuel) as ITP's RR kit does. It is a little tricky getting them both to play along with each other, but it's worth it having both of those together and that'll get you ready if you wanted to do bigger injectors.
Definately do an in-cab fuel psi gauge as the one that comes with the RR kit stays under the hood and for obvious reasons doesn't do you much good driving down the road occasionally(yea right) hitting WOT.
If it's a choice of one, I would do the RR kit.
2006 6.0 King Ranch DRW
Spartan Stage 1 Towing Injectors
Beta Spartan Phalanx
Suncoast Heavy Duty Torqshift Rebuild
ITP Fuel Regulated Return
Straight Piped MBRP 5" Exhaust
64mm Non-VGT turbo