Hey Jake, The Impreza RS FPR alone will richen the afr to around 10:1 or 11:1 at WOT high rpm which is beyond the optimum value for an NA motor. LAN's Stage 1 ecu programs a richer afr than stock, so using LAN's stage 1 with the Impreza RS FPR would result in an afr that is far too rich, probably around 9:1.
The maf bypass + the Impreza RS fpr are meant to be a low cost substitute for LAN's stage 1. Using the maf bypass + Impreza RS fpr + LAN's stage 1 together would provide no benefit. It would be a similar result to using just the Impreza RS fpr and LAN's stage 1, but not quite as rich of an afr, probably around 10:1 or 11:1.
I don't know if the Liberty fpr would work. The part number for the 2000 Impreza RS fpr is: 22670AA240. Try calling your local Subaru parts person to see if they stock that part number. If not, Auburn Subaru in the USA will sell you one and ship it for a very reasonable price. You'll want to speak to Jason Douglas in the Parts Dept. His email is
jdouglas@auburnsubaru.com.
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:: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ ::
1995 Laguna Blue SVX L AWD 5MT (sold)
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SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads.