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I would just got for there 550 rom tune if your going to stick to that power level....
The only way i would say it sok to use the s-afc is if you use it with a FPR as you mentioned, just because youw ant to limit how much fuel you pull pack (to lean out hte mixture).
If you really want something to go furthur look for a piggyback that can retard and advance timing as well as control fuel....SMT series do that as well as the greddy emanage and split second FTC (only retard).
again if you just wanted to stick with the 27 i would go with the rom tune for sure...
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