You didn't read that very carefully. The 200bhp+ gain for that RS7 is on 100 octane and is measured from the factory reported numbers on 91, which are waaaay low for those cars. 4200 pound, awd sedans trapping 120+ mph in the quarter. Please, that is a 600bhp car all day.
The gains on that chart that are applicable to this discussion would be more like 130bhp gain. That is the Stage 2 tune plus their downpipes on 93 vs. stock on 93. Factor in the APR exaggeration correction factor (they love taking the best run out of 5, not an average) and you are probably around 100 crank. And that is on a pretty exotic 4.0L V8. The heads on those things are works if art and the intake system is incredible, one of the big factors separating it from its lesser S6 bretheren.
I could sit here all day and pontificate on the RS6 but what the hell does that have to do with a 3.5L Ford engine? Not much I suppose.
I just want to be the voice of reason and remind you practice a bit of expectation management.
Haha. Right. Did I compare it to the ecoboost? Or maybe you struggle a bit with reading comprehension? There ARE platforms where people get those kinds of numbers out of cars with turbos. Some platforms are way over built and detuned so they are reliable. I strictly said you can get an extra 200hp out of some platforms with a tune and a downpipe. THAT is accurate. And THAT is exactly what I said. And to top that off I'm 100% against the ecoboost but I'm willing to bet this motor is over engineered a bit to try and make it as bulletproof as possible knowing that tuning companies are going to tune the shit out of them and the trucks will get molested like crazy. Ford isn't stupid and I am sure they have had their fair share of test mules out running around tuned well beyond the 450hp mark just to see how durable the engine is as well as the rest of the drivetrain. Time will tell but I'm willing to bet this engine has more potential than the previous 3.5L ecoboost. I'm sure the GT has crazy potential as well. Nobody knows yet but to say it's not possible is ignorant.