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I don't have a dyno of both but I have both tunes. I feel theat fa20 works better on my car by a substantial margin, your results may vary and John does an amazing job on FI tunes but fa20 has provided me much better support and sends me updated maps all the time when I make changes which is often. I have nothing against John at all he does incredible work and I hope to have him help me get a litchfield supercharger. My car just seems smoother on the fa20, John may beat it on the dyno I don't know they are both great tuners and as I've said before John is a master of the manual trans cars but I think fa20 does better on the autos. Hopes this helps a little you can't go wrong either way.
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