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You can live without a FPR, people made due forever without them until recently when everyone thinks they need one. With a hacked 1G mas on a 1G, you are almost always going to be lacking fuel at idle/low throttle even with 550s so too much fuel pressure under vacuum on a 1G isn't the worst thing ever. With an unhacked 2G MAS on a 2G, the 2Gs shitty fuel return setup and the 2Gs higher base fuel pressure it can be more of a problem on a 2G. You will need to do something about your stock 1G MAS though, it will metering problems pretty early on.
Upto about 60psi the Walbro 255 and 255HP flow almost exactly the same amount, so any fuel overrun problems will be the same with either.
ShapeGSX ran 28psi on the EVO 16G and went quite fast, but you wouldn't want to do that without good race gas, head studs and some tuning. Otherwise most people run 16-20 on pump and 20-24 on race.
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