That's what I'm saying, it's not better in factory form due to the emissions regulation at the time. If the FT was tuned with the same AFR as the DT was allowed to be tuned it would be better.How would the FT be any better low in the rev range? The only advantage from more valves is flow which would only be evident at high rpm, no? Genuinely curious. If you have curves for both motors I'd love to see them.
It's not just about max flow. Having two smaller valves / intake runners instead of one big one increases the air velocity which is really important at low RPM. Not only is the air entering the cylinder a much higher velocity, it also enters at two different angles creating two different swirl rotations in the cylinder for more optimum fuel mixing and ignition events.
The piston combustion bowls are also very different in design. As is the injector location and angle it's sprays into the bowl. The injectors themselves are also different, all these plus other differences between the two add up to an overall better performing engine.