AGP would be able to develop a tune for you without your returnline, but it's recommended.
As said above, I'd go with the SCT first; that will get your fueling where it needs to be.
It'll put you in the safe zone, sure, but even I can say a 5 minute flash gave unbelievable results with power pickup compared to full piggyback tunes.
So far I'm loving their flash!
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