Well, you're really looking at two different setups. The S-afc will allow you to adjust your air fuel mixture and give you the most beneficial setting, but you need to be on a dyno to tune it correctly. It's normally a set it and froget it option.
The RPW FPR will allow you to adjust the pressure, but you won't get the accuracy with an air/fuel gauge, unless you get one that's calibrated. Keep in mind that the A/F gauge is only accurate at WOT and is primarily to make sure you don't run too lean at WOT.
Personally, I'm going with the FPR option, and yes, it will fit the 8G galants and is about a 30 minute bolt on based on conversations I've had with RPW. Hope that helps. I'm open to anyone else's expertise on this issue.
Chip
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