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There was a post which compared the FA20 and Visconti Stage 1 93 tunes on a dyno, but I can't find the thread. I don't remember exactly what mods were done to the vehicle but the FA20 off the shelf tune ran a bit too lean IMHO above 5000 RPM. That's why it is important at least right now to get datalogs and let the tuner make some adjustments. Out of a number of folks posting dyno plots with a Visconti 93 tune I haven't seen any with an AFR which looked unsafe at all.
I would always advocate to spend the extra money for a tune on a dyno or a good road tune dedicated to your car, especially if you have a bunch of modifications.
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