uh, sard or hks fuel rail?
the only HKS 3sgte fuel rail is for 3rd gen engines, and will not fit 2nd gens. i was unaware that sard made fuel rails for our cars.
Second Edit: from the sard website
SARD FUEL DELIVERY PIPE FOR TOYOTA MR2 - 3S-GTE 1993-1999 - $280.00 - SR63542
that means its only for 3rd gen 3sgte's too (mr2's in japan came with 3rd gen 3s starting in late 93 as a 94 model)
your fueling should be sufficent since your running or going to be using 550cc, but if thats on a stock ecu, your going to be running pig rich. SAFC should only be used with a AFPR (which you have) and a good wideband. use the FPR to reduce fuel pressure (aka, less fuel) to get a good A/F baseline and use the SAFC to add fuel where needed to keep it from going too lean. its a good idea to get a bored out fuel rail or aftermarket rail (not really necessary at your mod levels) since that will help keep the fuel evenly distributed under high flow.
DO NOT USE THE SAFC TO REMOVE FUEL, YOU WILL PULL TIMING AND WILL MORE THAN LIKELY DAMAGE YOUR ENGINE.
Really, if your going to spend $300+ on the SAFC, and then whatever your going to spend to get it installed (unless your a DIYer) and the cost to get it tuned and dyno time, you may as well spend the money to get a 550cc flashed rom. the cost difference will be minimal if any in the long run, you don't need to splice and tap wires (or make a pnp harness extension if you do it right), you'll be safer, and you can still tune your fuel a bit with your AFPR if you take it to a dyno and find out that your still a little rich or lean. if your ever planning on needing more than 550cc's, save yourself the time, effort, and money, and just get a ems. they can still be inexpensive like megasqirt's (you have to make your own wiring harness and there is no base tune), but if your not capable to wire it and tune it, its a better idea to spend the extra cash and get a PNP like aem or nemesis